Hospital and surgical insurance coverage. United States--1974.
D000293:Adolescent; D000328:Adult; D000368:Aged; D003710:Demography; D005260:Female; D006801:Humans; D007348:Insurance, Health; D007350:Insurance, Hospitalization; D007359:Insurance, Surgical; D008297:Male; D008875:Middle Aged; D014481:United States