Columbia subject headings:
Drug abuse--United States--Bibliography.
Epidemiology--Bibliography.
Older people--Alcohol use--United States--Bibliography.
Older people--Drug use--United States--Bibliography.
Harvard subject headings:
Drug abuse--United States--Bibliography.
Epidemiology--Bibliography.
Older people--Alcohol use--United States--Bibliography.
Older people--Drug use--United States--Bibliography.
Princeton subject headings:
Drug abuse--United States--Bibliography.
Epidemiology--Bibliography.
Older people--United States--Alcohol use--Bibliography.
Older people--United States--Drug use--Bibliography.