Field book of snakes of the United States and Canada / Karl P. Schmidt and D. Dwight Davis. Schmidt, Karl Patterson. 1890-1957. Davis, D. Dwight. (Delbert Dwight), 1908-1965. Snakes United States. Snakes Canada. Reptiles United States. Reptiles Canada. QL651 .S35 598.12 SCF Includes bibliographical references and index. New York : G. P. Putnam's Sons, c1941. c1941. 1941 Text xiii, 365 p. : eng United States. Canada. United States. Canada.