Photographic studies of some less familiar birds: Sooty Tern 01 January 1975 Comments Main paper ... Read More
FIELD-NOTES ON WHITE FEATHERING AT THE BASE OF THE BILL AND WHITE UNDER TAIL-COVERTS IN THE TUFTED DUCK 01 January 1975 Comments Main paper ... Read More
The Purple Gallinule in the marismas of the Guadalquivir 01 June 1974 Comments Main paper ... Read More