Report of the Little Owl Food Enquiry 1936-37, organised by the British Trust for Ornithology.

London: British Trust for Ornithology, 1938. Octavo, photographs, signature. Cover boards a little grubby and some spotting of endpapers, otherwise a very good copy.
Reprinted with corrections from British Birds, Volume XXXI, Nos. 6, 7 and 8.