Darwin, Charles. The origin of species by means of natural selection : the descent of man and selection in relation to sex / Charles Darwin. - Chicago : Encyclopaedia Britannica, c 1952. - Vols. : ill. ; 25 cm. Includes index. V. 49-- ; 338 338 ISBN: 0-85229-163-9 Subjects--Topical Terms: Natural selection--Human beings--Origin. Dewey Class. No.: 808.8 / H971g