Books by Christopher Helm
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Wildfowl: an Identification Guide to the Ducks, Geese and Swans of the World (Helm Identification Guides)
Author(s): Madge, Steve & Burn, Hilary
ISBN-13: 9780713636475
Sylvia Warblers: Identification, taxonomy and phylogeny of the genus Sylvia (Helm Identification Guides)
ISBN-13: 9780713639841
Kingfishers, Bee-Eaters and Rollers : A Handbook
Author(s): C. Hilary Fry
ISBN-13: 9780713652062