An empirical test of three hypotheses concerning the human sex ratio at birth in the United States, 1915-1948.
D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D036801:Parturition; D011153:Population; D012744:Sex Ratio; D014481:United States; D014798:Vital Statistics
INFANT, NEWBORN; POPULATION; VITAL STATISTICS