Trends in "Prematurity". United States: 1950-67 .An analysis of the trend in live births registered in the United States, 1950-67 by weight at birth and period of gestation,including an assessment of the quality of the data....
Card's contents:VITAL AND HEALTH STATISTICS. 192,059 ANALYTICAL STUDIES. Ser. 3.Nr.15. Trends in "Prematurity". United States: 1950-67 .An analysis of the trend in live births registered in the United States, 1950-67 by weight at birth and period of gestation,including an assessment of the quality of the data.... Rockville 1972 U.S.Department of Health, Education,and Welfare,Public Helalth Service 4 ° s. IV, 51, ilustr. Vital and Health Statistics.Analytical Studies.Ser.3 Nr 15.