Becker, George C. Introductory concepts of biology / [by] George C. Becker. - New York : Macmillan , [1972] - xvi, 335 p. : ill. ; 25 cm. Includes bibliographical references : (p.319-321) and index. LCCN: 72-151170 Subjects--Topical Terms: Biology. Dewey Class. No.: 570