Demographic analysis : selected readings / edited by Joseph J. Spengler and Otis Dudley Duncan. - Glencoe, Ill. : Free Press, c1956 [ printing 1963]. - xiii, 819 p. : ill. ; 25 cm. Bibliography: p. 785-813. Subjects--Topical Terms: Population. Dewey Class. No.: 304.601 / DEM 1963