The problems of aging. 1957.
Bortz
Edward L
EL
D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D006301:Health Services Needs and Demand; D006299:Health Services for the Aged; D006801:Humans; D008136:Longevity; D009026:Mortality / Q000639:trends; D014481:United States / Q000453:epidemiology