Casterline, John B. The Onset and pace of fertility transition : national patterns in the second half of the twentieth century / John B. Casterline - New York : PC , 1999 - 66p. : ill. ; 22 cm. - PC Policy Research Division Working Papers No. 128 . Includes bibliographical references and index. Subjects--Topical Terms: FertilityPopulation Gov. Doc. Class. No.: US PC PRD WP-128