Colour negatives taken in the Hong Kong Zoological and Botanical Gardens, of the mammal house, dated November 1974; lemurs, marmosets, a Celebes ape and an agouti, dated 1975; orangutans, dated May 1978; a hand-reared squirrel monkey and other mammals, dated 25 September 1975
Black and white and colour photographs, mainly of various zoos, including Frankfurt, Berlin, Jersey, Antwerp, Stuttgart, Bristol, Paignton, Thoiry, Ueno (Tokyo) and Singapore, as well as images of herpetological specimens in captivity
Mounted colour slides mainly of snake specimens, but also including images of the Hong Kong Zoological and Botanical Gardens and local landscape, along with some personal images
Handwritten notes by J D Romer on Hong Kong chelonians, lizards and amphibians, 1947-1965; Hong Kong amphibians, 1967-1981; Hong Kong chelonians and lizards, 1967-1981; Hong Kong snakes, 1947-1967; and Hong Kong snakes, 1967-1981
Articles of Association, 1923; Scientific Periodicals Committee minutes, 1922-1923; original drafts and notes on composition of World List, 1921-1922