The file comprises a card index referring mainly to places of natural history interest, with a brief description of each and notes on visitor access, bibliographic and reference sources, acknowledgements, places to visit and notes on the author's indexing system, and a separate gazetteer consisting of notes, information leaflets and press cuttings mostly relating to historical sites in Wales, with subsections on national nature reserves, the wildlife, plants and history of Harlech and botanical sites from the Nature Conservancy Council inventory, 1954-1986.