Boyd, Robert How humans evolved / Robert Boyd & Joan B. Silk. - 3rd ed. - New York : Norton, 2003 - xxiii, multiple page. : ill., maps. ; 28 cm. Includes bibliographical references and index. ISBN: 0393978540 LCCN: 2002075336 Subjects--Topical Terms: Human evolution. Dewey Class. No.: 573.2 / BOH