Rugh, Roberts The frog; its reproduction and development. - Philadelphia Blakiston 1952. - x, 336 p. illus. 24 cm. Bibliography: p. 311-320. LCCN: 51000470 Subjects--Topical Terms: FrogsEmbryology--Amphibians. LC Class. No.: QL959 / .R86 Dewey Class. No.: 597.8