Waddington, Conrad Hal, 1905- Principles of development and differentiation / [by] C. H. Waddi ngton. - New York : Macmillan , [1966]. - x, 115 p. : illus. ; 24 cm. - Current concepts in biology series. . Bibliography : p. 110-111. Subjects--Topical Terms: Embryology.Genetics.Cytology. Dewey Class. No.: 574.3 WAD