Effect of laying date on chick production in Oystercatcher and Herring Gull 01 January 1975 Comments Main paper ... Read More
Photographic studies of some less familiar birds: Black-billed and Yellow-billed Cuckoos 01 January 1975 Comments Main paper ... Read More
Notes on the winter roosting and behaviour of a pair of Nuthatches 01 January 1975 Comments Main paper ... Read More
New Palearctic bird sound recordings during 1966–67 01 January 1970 Comments Main paper ... Read More