Ryder, John P
-
The Wildfowl Trust Fifteenth Annual Report - Articles
A preliminary study of the breeding biology of Ross's Goose
Abstract PDF -
Wildfowl 22 - Articles
Distribution and breeding biology of the lesser snow goose in central Arctic Canada
Abstract PDF -
Wildfowl 26 - Articles
The significance of territory size in colonial nesting geese---an hypothesis
Abstract PDF -
Wildfowl 31 - Articles
The distribution, fall migration routes and survival of Ross's Geese
Abstract PDF