Burch, J. B. 1929- How to know the eastern land snails; pictured-keys for determining the land snails of the United States occurring east of the Rocky Mountain Divide. - Dubuque, Iowa, W. C. Brown Co. [1962] - 214 p. illus. 22 cm. - Pictured-key nature series . Subjects--Topical Terms: Gastropoda--United States. LC Class. No.: QL430.4 / .B87 Dewey Class. No.: 594.3