This fonds consists of six letters sent from Charlotte Auerbach to Raphael and Ruma Falk from 1987 to 1992, as well as two postcards. The letters still have their original envelopes, and were sent from Auerbach's home in Grange Loan, Edinburgh to the Hebrew University in Jerusalem. The correspondence is mostly about exchanging news and small talk, in Auerbach's "old age".

There is also a typed letter from Prof. Geoffrey Beale to "all old friends of Lotte", dated 16 August 1994 (she died on 17 March 1994). In it, he explains that he is "in process of preparing a biographical memoir of the late Professor Charlotte Auerbach of the Royal Society", that he "should ... be extremely grateful if any of her friends and relations ... could kindly sent [personal letters or documents] to [him]". He explains at the beginning of the letter that there are "very few personal letters or documents relating to her life and work", because she "apparently threw nearly everything of a personal nature away".