Bongaarts, John The fertility-inhibiting effects of the intermediate fertility variables / John Bongaarts - New York : Population Council (PC) , 1980 - 31p. : ill. ; 22 cm. - Working papers (Population Council. Center for Policy Studies) No. 57 . Includes bibliographical references. Subjects--Topical Terms: Fertility, Human--Mathematical models. Gov. Doc. Class. No.: US PC CPS WP-57