Tim Maroney's new book on Blavatsky and the relationship between occultism and horror fiction contains an analysis of the Hodgson report.
http://www.maroney.org/About_Dzyan.html
Chapter 13 of H. P. Blavatsky and the Theosophical Movement by Charles J. Ryan. A vigorous attack on Coulomb.
http://www.theosociety.org/pasadena/hpb-tm/hpbtm-13.htm
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