Leakey, Richard E. Origins : What new discoveries reveal about the emergence of our species and its possible future / Richard E. Leakey and Roger Lewin - New York : E. P. Dutton , 1977 - 246 p. : il. ; 25 cm. ISBN: 0525171940 Subjects--Topical Terms: Antropología Evolución humana LC Class. No.: GN 31.2 / L43.1977