Personal correspondence, 1931-1970, n.d.; correspondence following Sieff's death in 1972, especially regarding PEP / Israel Sieff Fund; brief correspondence, 2001, relating to Sieff family matters.

Personal correspondence, 1939-1959, covering Political and Economic Planning and various other matters; correspondence etc subsequent to Simon's death in 1972, some relating to the Simon Population Trust.

Personal correspondence, 1939-1959, covering Political and Economic Planning and various other matters; correspondence etc subsequent to Simon's death in 1972, some relating to the Simon Population Trust.

Personal correspondence, 1939-1959, covering Political and Economic Planning and various other matters; correspondence etc subsequent to Simon's death in 1972, some relating to the Simon Population Trust.

Personal correspondence, referring to various conservation issues.

Correspondence arising from Spicer's death only, chiefly letters to Nicholson from his widow, with typescript of obituary by Nicholson for The Times.

Shelfmarks MS. 15041/1728 and MS. 15041/1729 comprise two separate envelopes of correspondence placed in a larger one which is inscribed 'Tansley and Elton'. MS. 15041/1728 relates to Tansley and comprises correspondence, 1927, 1948-1955; from 1949 chiefly regarding Nature Conservancy business. Included is a page of manuscript notes by Nicholson headed 'Evolution of Ecology', 1997.

Shelfmarks MS. 15041/1728 and MS. 15041/1729 comprise two separate envelopes of correspondence placed in a larger one which is inscribed 'Tansley and Elton'. MS. 15041/1729 relates to Elton and comprises personal correspondence referring to various matters, including ornithology (1931-1932) and Nature Conservancy business (from 1954); draft of biographical note on Elton by Nicholson; some correspondence subsequent to Elton's death.

Letters to Nicholson chiefly regarding Political and Economic Planning topics.

Correspondence regarding various environmental issues and Earthwatch Europe business.

Correspondence regarding various environmental issues and Earthwatch Europe business.

Brief correspondence regarding the future of Tinbergen's fieldwork at Ravenglass, Cumbria.

Correspondence regarding manufacturing statistics etc, 1947-1952; correspondence subsequent to Tizard's death in 1959, chiefly related to biographical points.

Personal letters to Nicholson.

Correspondence regarding Veprintsev's article on 'Numenius minutus' and related correspondence.

Personal correspondence chiefly covering conservation issues, 1943-1946, 1969-1977, n.d.; typescript draft of short obituary for Ward by Nicholson (publication unknown); one later letter referring to Ward.

Letter to Nicholson regarding economic matters etc and later personal correspondence.

Personal correspondence.

Personal correspondence.

Personal correspondence, chiefly 1946-1950, regarding post-war European political and economic issues (some PEP business included). Other correspondents are included. (Folder 1 of 2)