The file comprises articles by Condry entitled 'The Dovey Estuary' which includes information about Ynys-hir as a newly formed RSPB nature reserve, Other Aspects of Nature at Ynyshir',Bird Garden From Rough Pasture' and `Autumn Tide'.

The file comprises card index entries covering Condry's own writing, photographs, bibliographies and other literary sources, birds, fish, animals, insects, plants, trees, habitats, climate, important figures such as George Borrow and Thoreau, and places of interest, with a section specifically about Ynys-hir. Some notes are quite detailed, accompanied by relevant cuttings and correspondence, which includes letters from Prof. E. G. Bowen, 1982, regarding St Beuno and Bardsey, Arthur Chater, 1963, 1992, on history books of Welsh interest and a plant species, Pip Miles on entomology, 1958, 1975, Derek [Ratcliffe], 1981, mainly concerning peregrine falcons, H. R. H. ('Taff') Vaughan, 1976-1977, on the history of local industries, and Irene ('Benjamin') Vaughan (1976), on the wild service tree.

The file comprises miscellaneous newspaper articles, mainly on birds, some of which were written for the Cambrian News , 1949-1950, twenty one cuttings of 'A Welsh Nature Note', some dated 1949-1951, articles relating to the Guardian Country Diarists, 1974, polecats, Condry's wardenship of Ynys-hir, and kites, together with correspondence, 1962 and 1966, in connection with the 'Country Diary' column.

The file comprises: a brief article by Penny Condry, 1999, recording that three hornbeams had been planted in her husband's memory at Ynys-hir RSPB reserve; dedication of a booklet recording the recoveries of birds ringed by Bardsey Observatory; an appreciative acknowledgement by Penguin Collectors' Society; a note recording the dedication of a birdwatching hide and additional land at Ynys-hir to the memory of William Condry; and further tributes to his life's achievements, 2002-2020.

The series consists of warden's monthly reports, 1969-1980, Ynys-hir nature reserve annual report and draft, 1981, 1990, and a checklist of birds on the reserve, 1983