Cohen, Jack. Living embryos; an introduction to the study of animal development. - [2d ed., rev. and enl.] - Oxford, New York, Pergamon Press [1970] - x, 156 p. illus. 20 cm. Subjects--Topical Terms: Embryology. LC Class. No.: QL955 / .C59 1967 Dewey Class. No.: 591.3/3