The series comprises manuscript and typescript drafts of articles, notes, correspondence, printed articles, pamphlets and press cuttings, 1947-1998. Recurrent topics include birds, especially birds of prey and bird migration, the natural history of Africa, woodlands, the wildlife of historic sites and British mammals. The publications for which the articles were intended are not usually specified.

The series comprises notes, articles, correspondence, newsletters and surveys concerning the identification, distribution and habits of birds, insects and mammals.