Burch, J. B. 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 . 920222 LCCN: 61018612 /L/r892 Subjects--Topical Terms: Gastropoda--United States. LC Class. No.: QL430.4 / .B87 Dewey Class. No.: 594.3