Originally housed in a ringbinder this file is a counterpart of Acc.13328/1638. The original ringbinder was annotated as follows: "A-K, Researchers, May 1989-closed May 1992", however there are letters outlying both these dates, beginning in 1980, and finishing in 1991. Letters have been arranged alphabetically by researcher surname, subject surname, and/or organisation name. Original and copy letters are present.