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The bulk of this material dates from the 1980s and 1990s. The content is enormously diverse. Thank you letters, sometimes charmingly illustrated, from young children, may be found next to reminiscences from aged contemporaries, chatty letters from former pupils next to detailed scientific correspondence.

H1-H95 Scientists and mathematicians. Arranged alphabetically by scientist. For material re Sir Harold Jeffreys see A94-A186.

H96-H108 History of mathematics and science.

Spiral bound, hardback, and pocket diaries.

Includes material relating to HJ's death (A94-A103), biographical material (A104-A115), obituaries, tributes and reminiscences (A116-A151), Biographical Memoir (A152-A161), memorials (A162-A167), correspondence re HJ (A168-A181), and material relating to HJ's work (A182-A186).

J43-J141 Sequence found in wooden filing drawers

J142-J160 Sequence found in metal filing drawers. This was divided into groups of letters, e.g. 'A-C'. The material has been further subdivided for ease of reference where required. The bulk dates from the late 1980s to the early 1990s.

J161-J189a Sequence found in envelopes and folders. Although there are earlier letters, the bulk dates from the 1990s.

J190-J207 Sequence divided by index card. This was divided by letter. It is personal correspondence, including many greetings cards. It dates from the 1990s although a large proportion of the correspondence is undated. Many of the correspondents are identified by first name only and not all appear to have been correctly filed. They include family members, although Jeffreys also seems to have often been accorded the title 'Aunt' by children of friends and former students. Retained in original order.

This sequence is Jeffreys's own arrangement of folders on specific research topics. The bulk are identified by Jeffreys herself by index cards (C6) and a filing cabinet index (C7). Many correspond to publications by Jeffreys and appropriate cross-references are included.