The Haldane Society’s archives are kept at the LSE Library. Access is available to members of the public. Details are here http://archives.lse.ac.uk/Record.aspx?src=CalmView.Catalog&id=HALDANE+SOCIETY
Information on using the reading room at the LSE Library is here http://www.lse.ac.uk/library/usingTheLibrary/accessingMaterials/readingRoomAccess/home.aspx.
A more detailed survey list is available on request.