Home   News     About Static   Papers   Draft Test Standard   Calibration   Sitemap   JNC Bio   Vacuum studies   Letters to Editors   Philosophic Notes    Paintings    Contact;


1. Papers relating to Static Electricity

2. Papers relating to work on high vacuum technology

3. Patents

4. Reports on work done at UKAEA Culham Laboratory

5. Letters to Editors

6. Biographical notes on John Chubb


1. Papers relating to Static Electricity 

  1. "Behaviour of airborne particles during processes relating to dust collection" PhD Thesis, Univ Birmingham 1958.

    (Figures showing core features of this PhD Thesis work and a photo of the experimental equipment are available on this Website)

  2. "Experimental studies of airborne particle behaviour in corona discharge fields" IEE Coll on Electrostatic Precipitators, Feb 1965 with J. B. Higham and W. D. Bamford
  3. "Radio detection of low energy electrostatic sparks" Nature 245 (5422) 1973 p206 with S. K. Erents, I. E. Pollard
  4. " Radio detection of low energy electrostatic sparks "IEE Confr on Gas Discharges, London 9-12 September 1974 (IEE Confr Publ 118)
  5. "An instrument to measure electric fields under adverse conditions" Static Electrification 1975 Inst Phys Confr Series 27 1975 p182
  6. "Techniques for assessment of electrostatic ignition hazards" 2nd Int Confr on Electrical Safety in Hazardous Environments, J N Chubb, I E Pollard, G J Butterworth IEE Dec 1975
  7. "Practical and computer assessments of ignition hazards during tank washing and during wave action in part ballasted OBO cargo tanks" J. Electrostatics 1 1975 p61. On line via:
  8. Discussion contribution to: "The prevention of cargo fires and explosions on oil tankers" Proc 2nd West European Confr on Marine Tech London May 23-27 1977 p130
  9. "Methods for examining electrostatic ignition hazards" International Symposium on Grain Elevator Explosions, National Academy of Sciences, Washington DC. July 11-12, 1978
  10. "Instrumentation and techniques for monitoring and assessing electrostatic ignition hazards" J N Chubb, G J Buttworth. Electrostatics 1979 Inst Phys Confr Series 48 1979 p85-95
  11. "The detection and characterisation of electrostatic sparks by radio methods" G J Butterworth. Electrostatics 1979 Inst Phys Confr Series 48 1979 p97-105
  12. "Electrostatic ignition hazards associated with the preventative release of fire extinguishing fluids; Electrostatics 1979 Inst Phys Confr Series 48 1979 p161-169 paper by John Butterworth ]
  13. "Particle monitor" UK patent GB 2 026 276B Filed 23 July 1979
  14. "Computer modelling of electrostatic conditions and hazards in tank washing" J. Electrostatics 9 1980 p71 with K. P. Brown and G.J. Butterworth
  15. "Equipment and approaches relevant to the assessment of large scale electrostatic ignitionn hazards" IEEE-IAS 1982 Annual meeting San Fransisco 4-7 October 1982
  16. "Charge transfer and current flow measurements in electrostatic discharges" J. Electrostatics 13 1982 p209 with G.J. Butterworth. On line via:
  17. "Equipment and techniques for the assessment of practical electrostatic ignition hazards" Third International Conference on 'Electrical Safety in Hazardous Environments' IEE, London 1-3 December 1982
  18. "Assessment of electrostatic ignition hazards during tank filling with the aid of computer modelling" J. Electrostatics13 1982 p9 with G. J. Butterworth and K. P. Brown On line via:
  19. "Interpretation and computer modelling" InternationalWorkshop on Electrostatics, Llandudno, 28-29 Sept 1983, Oyez Scientific and Technical Services
  20. "A study of the incendivity of electrical discharges between planar resistive electrodes" Electrostatics 1983 IoP Confr Series 66 p185 with G. J. Butterworth and E. S. Paul
  21. "Developments in electrostatic fieldmeter instrumentation" J. Electrostatics 14 1983 p349
  22. "Evaluation and prevention of electrostatic hazards associsted with oil tanker operations" Contribution to discussion of paper by Mills and Oldham Trans I Mar E (TM)
    paper 44 1983 p349
  23. "The measurement of electrostatic parameters and their interpretation" International Symposium on Electrostatics- Applications and Hazards. Oyez, Southampton 26 - 28 September 1984
  24. "Instrumentation for Electrostatic Measurements" J. Electrostatics 16 December 1984 p1. with P. E. Secker On line via:
  25. "The control of static electricity" Electrostatics Summer School '85, University College of North Wales, Bangor, Sept 1985
  26. "The performance capabilities of electrostatic fieldmeters" Nuisances electrostatiques dans la fabrication et l'utilisationdes composants et materials electroniques. SEE Confr Nice 9-10Oct 1986 p93-95
  27. "The calibration of electrostatic fieldmeters and the interpretation of their ob servations" Electrostatics '87. Inst Phys Confr Series No. 85 1987 p261
  28. "Charge decay measurements for characterising static dissipative materials"; IEE Confr on 'Dielectric Materials, Measurements and Applications'. Univ Kent, Canterbury. 27-30 June 1988 p283-285
  29. "Electrostatic measurements and standards" Electrostatics Summer School '89, University College of North Wales, 28-30 June1989
  30. "Novel approach to control static risks from solder resist and conformal coatings on printed circuit boards" Letter to the Editor, Soldering and Surface Mount Technology, June 1990 p89
  31. "Two new designs of 'field mill' type fieldmeter not requiring earthing of rotating chopper" IEEE Trans Ind Appl 26 (6) Nov/Dec 1990 p1178
  32. "Instrumentation and standards for testing static control materials" I EEE Trans Ind Appl 26 (6) Nov/Dec 1990 p1182
  33. "Measurement techniques and instruments" 'Electrostatic hazards - their evaluation and control' Seminar by J. N. Chubb at Centre for Industrial Safety and Health Technology, ITRI, Taiwan 22-24 April 1991.
  34. "Instrumentation for on-line measurement of the charge dissipation capabilities of web and coated film materials" Electrostatics '91 IoP Confr Series 118 p153 with J. Harbour, P. Domenichini
  35. "A novel instrument to monitor and size classify airborne fibres in the respirable size range" Electrostatics '91 IoP Confr Series 118 p169

    (A figure showing core features of this Fibre Monitor work are available on this Website)
  36. "Methods prop osed for the calibration of static measuring instruments" European ESD Symposium, Eindhoven, Netherlands.4-5 Sept 1991.EESDA Secretariat, Marketplace PR (London) Ltd,PO Box 90, Crowthorne, RG11 6PX.
  37. 'Measurement of electrostatic parameters for assessing industrial electrostatic problems' Electrostatic hazards in industry IBC Seminar, London 14/15 Nov 1991
  38. "Experimental comparison of methods of charge decay measurements for a variety of materials" EOS/ESD Symposium,Dallas, 1992 p 5A.5.1 with P. Malinverni
  39. "Calibration of instruments for electrostatic measurements" IEE Coll 'Significance of calibration' IEE Feb 23, 1993 (IEE Digest 1993/047)
  40. "Comparative studies on methods of charge decay measurement" J. Electrostatics 30 1993 p273 with P. Malinverni On line via:
  41. "Design and performance of new instrumentation to measure the shielding capabilities of materials against electrostatic discharges" J. Electrostatics 30 1993 p307 with C.Hancox, J. Harbour On line v ia:
  42. "Measuring the shielding performance of materials and assemblies" IEE Colloquium on 'Low cost EMC testing' Univ Birmingham Sept 21, 1993 (Digest 1993/169) with C. Hancox, J.Harbour
  43. "Measurements for the assessment of ignition risks from static electricity"; IEE Coll on Electrostatic Problems during Material Handling, London Feb 15, 1994 (IEE Digest 1994/041) with J. Embury; D Bourne, S. Southall
  44. "Developments in methods used to determine the electrostatic characteristics of materials with comments on approaches to control static" Process Safety: The European Dimension. IBC TechServices Confr London 16/17 Nov 1994
  45. "Methods of measurement to assess the suitability of materials for the control of static electricitys" ESD and ESD Control Measures' IEE Coll, Savoy Place, 28 March, 1995
  46. "Dependence of charge decay characteristics on charging parameters" Electrostatics 1995 Confr, Univ York, April 3-5,1995 Inst Phys Confr Series 143 p 103
  47. "Testing how well materials dissipate static electricity"British Plastics and Rubber, May 1995, p8
  48. "Avoiding risks from static electricity" 'Evaluation Engineering' September, 1995 p57
  49. "Reappraising static materials" Cleanroom Technology Winter 95/96 p4
  50. "Corona charging of practical materials for charge decay measuremen ts" Journal of Electrostatics 37 1996 p53 On line via:
  51. "Static: A material problem" Converting Today,May 1996 p21
  52. "Instrumentation to assess the static charge dissipation capabilities of materials" 13th Int Symp Contamination Control, The Hague 16-20 Sept, 1996
  53. "Rebuttal letter #2 re 'Decay test..Is it science based" Letter to the Editor of EOS/ESD 'Threshold', Dec 1996 p9
  54. "Electrostatic measurement tec hniques for risk assessment" Process Safety - European Update, IBC Conferences, London, 20/21 October 1997
  55. "Instrumentation and measurements to assess electrostatic conditions and risks in cleanroom situations" Cleanroom Technology Expo Conference, Frankfurt, 7 May, 1998 Angel Business Communications, London.
  56. "The assessment of materials by tribo and corona charging and charge decay measurements" Paper presented at 'Electrostatics 1999' Conference in Cambridge, March 29-31, 1999. Inst Phys Confr Series 163 p329-333.
  57. "Experience with electrostatic fieldmeter instruments with no earthing of the rotating chopper" Paper presented at 'Electrostatics 1999' Conference in Cambridge, March 29-31, 1999. Inst Phys Confr Series 163 p443-446.
  58. "Assessment of materials for static risks"; Letter to the Editor EOS/ESD Association Newsletter "Threshold" April/May, 1999 p3.
  59. "Electrostatic test methods compared" R. Gompf (NASA), P. Holdstock (BTTG), J. N. Chubb (JCI) EOS/ESD Symposium, Orlando, Florida. Sept 26-30 1999

  60. "Measurement of trib o and corona charging features of materials for assessment of risks from static electricity" IEEE Transactions on Industry Applications 36 No 6, Nov/Dec 2000 p1515-1522. (Paper presented at IEEE-IAS Meeting, Phoenix, Arizona 3-7 Oct, 1999).

  61. "The control of risks from static electricity" On-line ESD Journal, Jan 2000

  62. "Electrostatic control in cleanrooms" with Paul Holdstock (BTTG). Society of Environmental Engineers 3C 2000 Conference at the NEC in Birmingham, 16/17 February 2000

  63. "Chargeability and influence of surface char ge"; Letter to the Editor EOS/ESD Association Newsletter 'Threshold' January/February 2000 p6.

  64. "Resisting the charge" Article in 'Packaging Technology', May/June 2000 p13 (Turret RAI plc).
  65. "New approaches for electrostatic testing of materials" 'Journal of Electrostatics' 54 (3/4) March, 2002 p223. On line via: presented at the Electrostatics Society of America 'ESA 2000' meeting, Niagara Falls, June 18-21, 2000).
  66. "A system for the advance warning of lightning" Paper presented at the Electrostatics Society of America 'ESA 2000' meeting, Niagara Falls, June 18-21, 2000 (Abstracts for ESA2000 are available on the ESA Website -
  67. "FIBC ignition risks from static electricity" Article in 'Bulk Handling International', May/June 2000 p25 (Turret RAI plc).
  68. "FIBC earth monitoring" (Reply to letter on article 'FIBC ignition risks from static electricity') Letter to Editor, 'Bulk Handling International', July/August 2000 p4 (Turret RAI plc).
  69. "Measuring the shielding performance of materials" Paper presented at the 2000 IEEE-IAS meeting in Rome 8-12 October. (Click here for ove rhead slides presented)
  70. "Comment: Voltage on insulators IS meaningful!" Letter to the Editor EOS/ESD Association Newsletter 'Threshold' July/August 2001 in response article by Niels Jonassen in May/June 2001 issue of 'Threshold'.
  71. "Cleanrooms and static" 'Cleanroom Technology' (Polygon Media Ltd), October 2001 p30
  72. "Measuring the electrostatic suitability of materials" Paper presented at Institute of Physics, Static Electrification Group meeting 13 November at the Institute of Energy, Devonshire Street, London, W1G 7AU..
  73. "Can cleanroom garments create electrostatic risks?" Paper with Paul Holdstock (BTTG) and Mick Dyer (Barnet). 'Cleanroom Technology', 8 (3) March 2002 p38. On-line at: ESD Journal
  74. "Can one predict the surface voltages that will arise on cleanroom garments by tribocharging?". Paper with Paul Holdstock (BTTG) and Mick Dyer (William Barnet and Son). On-line at: ESD Journal
  75. "Assessing the influence of electrostatic charge retained on materials" 'Compliance Engineering' 2002 Reference Guide p124.
  76. "How effectively do materials shield against transient electric fields?" IEEE Ind Appl Magazine 8 (5) Sept/Oct 2002 p13 (Based on paper presented at the 2000 IEEE-IAS meeting in Rome 8-12 October, 2000. (Click here for version of paper as presented in Rome)
  77. "A review of new test methods for evaluating the electrostatic propensity of textile materials" P. Holdstock (BTTG) and J. N. Chubb. 5th International Symposium EL-TEX 2002, Lodz, Poland, 14-15 Nov 2002.
  78. "Assessing the suitabilitiy of materials" Paper presented at Institute of Physics 'Electrostatics Group' meeting 8 Jan, 2003, in London.
  79. "Static electricity: Assessing problems and solutions" J. N. Chubb 'Pharmaceutical Cleanrooms 2003' 17-19 March, 2003 De Vere University Arms Hotel, Cambridge.
  80. "Predicting the maximum voltages expected on inhabited cleanroom garments in practical use" J. N. Chubb, P. Holdstock (BTTG) and M. Dyer (William Barnet and Son Inc), Institute of Physics Conference 'Electrostatics 2003' Heriot Watt University, Edinburgh, 23-27 March, 2003. IoP Conference Series 178 2004 p131
  81. "Electrostatic safety during the solvent extraction of copper" J. N. Chubb, P. Lagos (IDT, Santiago, Chile) and J. Lienlaf (Codelco Chile - Radomiro Tomic, Chile). J. Electrostatics 63 2005 p119-127 and on line via: (Paper presented at Institute of Physics Conference 'Electrostatics 2003' Herio t Watt University, Edinburgh, 23-27 March, 2003).
  82. "Predicting the maximum surface voltages expected on inhabited cleanroom garments in practical use" J. N. Chubb, P. Holdstock (BTTG) and M. Dyer (William Barnet and Son Inc), Paper presented at ESTECH 2003, Contamination Control Division, Phoenix, Arizona.18-21 May, 2003 Published in '2004 Journal of the IEST Vol. 47 No. 2'.
  83. "Test procedures for predicting surface voltages on inhabited garments" Paul Holdstock (BTTG), Michael J D Dyer (Barnet), John Chubb (JCI). EOS/ESD 25th ANNUAL SYMPOSIUM. Riviera Hotel, Las Vegas, Nevada, USA 21-25 September 2003. J. Electrostatics 62 2004 p231-239 On line via:
  84. Assessment of materials, Letter to the Editor, ESD Association Newsletter "Threshold" July/August 2003 p10
  85. "Garments and electrostatic performance" 'Cleanroom Technology', 9 (6) July/August 2003 p36.
  86. Standards: "Comments on the preparation of 'Standards' in electrostatics". On-line at: ESD Journal 27 July, 2003. ESA (Electrostatics Society of America) Newsletter Nov/De c 2004 p3
  87. "Surface potential helps assess ESD properties of materials" 'Evaluation Engineering' 42 November, 2003 p54
  88. "Can we avoid problems from static electricity?" 'Cleanrooms' October, 2003.
  89. "Static problems with wrong materials" 'Electronics manufacture and test' November, 2003.
  90. "Avoiding risks and problems from static electricity" 'Converter' December, 2003 p18.
  91. "Comments on methods for charge decay measurement" J. Electrostati cs 62 2004 p73-80. On line via:
  92. "Electrostatic Ignition Risks and Tank Washing Operations" Article in Toftejorg On-line magazine Dec 2004 (

  93. "Electrostatic safety during solvent extraction" Paper by John Chubb and Graham Hearn presented at Centre for Separation Technology Workshop at Lappeenranta University of Technology, Lappeeranta, Finland 8 & 9 August, 2005
  94. "Measurement of charge transfer in electrostatic discharges" J. Electrostatics 64 (5) 2006 p301-305 (see via
  95. "Non-contact measurement of electric field shielding performance and the resistivity of layer materials" J. Electrostatics 64 (10) 2006 p685-689
  96. "Assessing the electrostatic suitability of modern materials" 'Evaluation Engineering' 24 August 2006
  97. "A Standard proposed for assessing the electrostatic suitability of materials" J. Electrostatics 65 2007 p607-610
  98. "Tackling static problems" 'Converter' 44 (12) Dec 2007 p19 Faversham House Group Ltd
  99. "Tribocharging studies on inhabited cleanroom garments" J. Electrostatics 66 2008 p531-537. Online via:
  100. "A prickly issue" Cleanroom Technology, 16 March 2009 p27-28. Online via:
  101. "Instrumentation for long term continuous measurement of ground level atmospheric electric fields" Paper presented with Ian Pavey at Inst Phys 'Environmental Electrostatics 2' meeting 24 June, 2009 at Institute of Physics, London.
  102. "RISKS OF IGNITION FROM TYPE D UNGROUNDED FIBC" Paper with Paul Holdstock on avoidance of risks of ignition with unearthed Type D FIBC. The present studies show how the effective resistivity of conductive features within FIBC type fabrics can be measured, without electrical contact, from the variation of shielding performance with frequency. From such measurements an empirical acceptance criterion has been derived that matches well to the results of gas probe ignition tests. Studies are proposed to provide reliable criteria for assessing FIBC Type D ba g materials and to help optimize FIBC fabric design.

    J Electrostatcs 68 2010 p145-151

  103. "ANALYSIS OF LONG CORONA CHARGE DECAY TIMES" Experience has shown that with long charge decay time materials the local charge decay time constant comes to increase linearly with time during the progress of charge decay. This is an empirical result. This linear increase provides the basis for calculating the time to 1/e and/or to 10% from much shorter periods of observation. This approach is useful for assessing and comparing materials that have decay times over say 10(4) seconds.

    J Electrostatcs 68 2010 p284-286

  104. "Letter to the Editor: Assessing the electrostatic suitability of cleanroom garments" Cleanroom Technology, April 2010
  105. "Letter to the Editor: Assessing the electrostatic suitability of garments for use in electrostatically sensitive work areas" J. Electrostatics 68 2010 p404
  106. "OPERATIONAL HEALTH MONITORING FOR CONFIDENCE IN LONG TERM ELECTRIC FIELD MEASUREMENTS" The paper by John Chubb and John Harbour describes practical aspects of electrostatic fieldmeter instrumentation for long term monitoring of electric fields in adverse environmental conditions. Examples of applications have been in studies of tank washing on large crude oil tankers and measurement of atmospheric electric fields. Particular attention is drawn to the technique developed for continuous monitoring of operational health to justify confidence in observations. J. Electrostatics 68 2010 p469-472.
  107. "AN INTRODUCTION TO ELECTROSTATIC MEASUREMENTS" Book by John Chubb published by Nova Publishers 2010 (ISBN: 978-1-61668-251-4)
  108. The book presents the experience John Chubb has gained from his work on static electricity from over 50 years of involvement. This is not an academic textbook and does not aim to cover every aspect of electrostatics. Rather it outlines the features required for good quality electrostatic measurements and presents the results of the experience gained from devising, developing and manufacturing a range of practical instruments. The book concentrates on the design and practical features of ?Äòfield mill?Äô electrostatics fieldmeters, on the use of corona charge decay as an appropriate method for assessing the electrostatic suitability of materials, on the use of capacitance loading as an additional relevant characteristic of materials, on a novel method for measuring the ability of materials to provide shielding against transient electric fields and on methods for calibration of electrostatic measuring instruments. Experience is described from a variety of practical studies of electrostatic problems.

  109. "LETTER TO THE EDITOR" ESDA Threshold 26 (5) Sept/Oct 2010 p5
  110. "STUTTER TIMING FOR CHARGE DECAY MEASUREMENT" The paper describes the approach of "stutter timing" that has been developed to improve the accuracy of measuring charge decay times in the presence of noise in compact and portable charge decay test instrumentation. The approach involves starting and stopping the timing clock as the noisy signal rises above and falls below the target threshold voltage level. Paper presented at Institute of Physics "Electrostatics 2011" Conference, Bangor, April 2011. IoP Conference Series 301 2011
  111. "Assessing the electrostatic suitability of materials" Paper with Ian Pavey presented at Electrostatics Society of America meeting Cambridge, Ontario, Canada June 12-14 2012. Papers available at: (
  112. "The measurement of atmospheric electric fields using pole mounted electrostatic fieldmeters" J Electrostatics 72 2014 (4) p295-300
  113. A pole mounted field mill type electrostatic fieldmeter provides a simple and practical way for measurement, and for long term continuous monitoring, of ground level atmospheric electric fields. The paper describes a number of studies of this measurement method. These show how atmospheric electric field values are derived from the response of the fieldmeter when earth bonded and its height above ground level. The response of the fieldmeter is calibrated via the linear variation of its response to voltage applied during the set up procedure. The studies confirm a linearity of fieldmeter response with height above ground and independence of mounting orientation.

  114. "An alternative method for charge decay measurement to assess the suitability of materials"

    J Electrostatics 72 (5) 2014 p396-401

    A method of charge decay testing is proposed in which a localized electric field is applied by a fieldmeter to an area of the material to be tested. The variation of electric field is recorded as charge migrates across the surface. Arrangements are described for this method of testing and studies reported comparing results with corona and tribocharge decay measurements. Interesting differences are shown between the methods of testing. Induction charge decay testing is not proposed as a replacement for corona or tribocharge decay testing. It offers the opportunity for simpler instrumentation and measurement of faster charge decay times.


    The studies reported show that measurements of atmospheric electric fields by pole mounted electrostatic fieldmeters can match measurements by a horizontal antenna wire. However, significant differences can arise. These differences are tentatively attributed to tribocharging actions during initial set up of the antenna system and by wind blown airborne particulates at the antenna wire. Pole mounted fieldmeters provide opportunity for long term unattended measurements in quite adverse weather conditions with continuous checking of operational health against debris, spider webs, etc.

  116. "A 'Static' business" Physics World, January 2015. An outline history of the business of John Chubb Instrumentation.

  117. "How should the electrostatic suitability of materials be assessed?" J Electrostatics 77 2015 p163-165.

    There is no one single test that shows the electrostatic suitability of materials for all situations. The paper offers some more philosophic thoughts on the basic approaches that need to be adopted for methods to assess the electrostatic suitability of materials. In essence the recommendation is that test methods should be, or be close to, the relevant practical operation and situation. Alternative, perhaps more convenient measurement methods, need to be shown to match the results achieved in the relevant practical operation and situation.

  118. "Limitations on the performance of field mill fieldmeters with alternating electric fields" J Electrostatics 78 2015 p1-3.

    The response of field mill type electrostatic fieldmeters to alternating electric fields is limited by the chopping frequency. Measurement reported here show that alternating frequencies at the chopping frequency, and related harmonics, can create confusing low frequency outputs. Hence care is needed for interpreting observations where such alternating electric fields may be present.

  119. "Enhanced performance of field mill fieldmeters for alternating electric fields" Paper with John Harbour submitted to J Electrostatics, October 2015

    Standard field mill fieldmeters have a frequency response limited by the chopping frequency and show low frequency beat signals in their output when observing alternating electric fields near the chopping frequency and near harmonics of this. The paper reports experimental studies with a dual phase sensing system that show how the frequency response can be extended to at least 150 kHz with uniform sensitivity and beating problems inhibited.


A few documents have been prepared for consideration by Standards committees and these may be of interest:

"Test method to assess the electrostatic suitability of materials for retained electrostatic charge"

"Methods for the calibration of electrostatic measuring instruments"

"Test method to measure the surface voltages created on tribocharging inhabited garments"


Attached to this Website are two papers (1 & 2) presented at the Institute of Physics Annual Congress in Brighton, April 1998 on charging of the body getting out of cars. There are also some notes about the use of electrostatic fieldmeters for measuring atmospheric electric fields and suggested standard documents concerning instrumentation and procedures for assessing how effectively materials control the influence of retained static charge.


2. Click here for a list of earlier JNC papers published on high vacuum work on condensation pumping of hydrogen and Monte Carlo modelling of free molecular gas flow.


3. Click here for a list of Patents that have been registered


4. Click here for a list of a number of 'Letters to the Editor' that have been published


5. Click here for outline biographical notes on John Chubb

John Chubb, email:

Page Updated : 29/10/2015