Snyder, Laurence H. 1901-1986 The principles of heredity / by Laurence H. Snyder and Paul R. David. - 5th ed. - Boston : Heath, 1957. - xi, 507 p. : illus. 25 cm. Includes index. Subjects--Topical Terms: Heredity.Genetics Dewey Class. No.: 576.5 / SNP 1957