13 books • 5 series
The Collins Garden Birdwatcher's Bible
Wytham Woods
La Gran Enciclopedia de Las Aves
Photographic Guide to Birds of the World
Bird Life
Bird Population Studies (Oxford Ornithology)
The Mute Swan (Helm Field Guides)
New Generation Guide to the Birds of Britain and Europe
Avian Ecology (Tertiary Level Biology)
Encyclopaedia of Birds
British Tits (Collins New Naturalist, #62)
Evolutionary Ecology
Birds (Countryside S.)