Old-age, survivors, disability, and health insurance program, December 31, 1980.
D000368:Aged; D006233:Persons with Disabilities; D006801:Humans; D007342:Insurance Benefits; D008484:Medicaid / Q000331:legislation & jurisprudence*; D006278:Medicare / Q000331:legislation & jurisprudence*; D012179:Retirement; D012943:Social Security / Q000331:legislation & jurisprudence*; D014481:United States