00776nam 2200169z- 450 9910712446003321(CKB)5470000002493683(EXLCZ)99547000000249368320230509c1978uuuu -u- -engSkeletal maturity of youths 12-17 years : racial, geographic area, and socioeconomic differentials, United States, 1966-1970Hyattsville, MdU.S. Department of Health, Education, and Welfare, Public Health Service, National Center for Health StatisticsSkeletal maturity of youths 12-17 years BOOK9910712446003321Skeletal maturity of youths 12-17 years : racial, geographic area, and socioeconomic differentials, United States, 1966-19703342153UNINA