Books by John L. Bull
The easy bird guide
Bull's birds of New York State
The National Audubon Society field guide to North American birds
Birds of North America, Wester
Birds of North America, Western Region
Birds of North America/Eastern
Birds of North America/Eastern Region
The Audubon Society field guide to North American birds, eastern region
Supplement to Birds of New Yor
Supplement to Birds of New York State
Birds of New York State
The birds of the New York City
The birds of the New York City area