Caldwell, John C. The socio-economic explanation of high fertility : papers on the Yoruba Society of Nigeria / John C. Caldwell. - Canberra : Dept. of Demography, Australian National University, 1976. - vii, 133 p. ; ISBN: 0708101437 Subjects--Topical Terms: Yoruba (African people)-Economic conditions.- Dewey Class. No.: 304.6309669 / So