We are especially grateful to the following archivists for advice on permissions and other suggestions about the content of this site: Lia Apodaca and Len Bruno, Library of Congress; Jens Boel and Mahmoud Ghander (UNESCO); Lesley Hall (Wellcome); John Spalek (New York State University archives, Albany); Nellie Thompson (New York Psychoanalytical Society); Sanford Gifford and Olga Umansky (Boston Psychoanalytic Society); Diane Richardson (Cornell Medical Library); Stephen Roeper (University Library, Frankfurt), Larry Hughes (NARA), and Bob Clark and Virginia Lewick (Roosevelt Presidential Library).

Alan Forth, Adrian Tribe and Ali Watson at Birkbeck have offered invaluable help. We are also most grateful to Adrian Dicks (and family) for permission to include excerpts from the papers of Henry Dicks, and to Richard and Bridget Astor, for agreeing to the inclusion of some material from the late David Astor's archive. Dr Scott Anthony (Cambridge University) helpfully drew our attention to J. T. MacCurdy's analysis of Hitler's speech. Special thanks to Nadia Atia, Emma Beer and Stuart Oglethorpe for key editorial work, and to Dirk Zhang, who designed the site.