Bull, John The Audubon Society field guide to North American birds : Eastern region / John Bull and John Farrand, Jr. - New York : Alfred A. Knopf , c1977. - 775 p. : il. retrs. ; 21 cm. ISBN: 0-394-41405-5 Subjects--Topical Terms: Birds---North America Dewey Class. No.: 598.2 BUL