Hiroshi, Kojima Sibling confiquration and marriage timing in Japan / Kojima Hiroshi - Tokyo : Ministry of Health and Welfare (MHW) , 1993 - 54p. : ill. ; 30 cm. - Working paper No. 13 . Includes bibliographical references. Subjects--Topical Terms: MarriagePopulation Gov. Doc. Class. No.: JP MHW IPP WP-13