Columbia subject headings:
Methadone maintenance--Research--United States--Abstracts.
Methadone maintenance--Research--United States--Bibliography.
Harvard subject headings:
Methadone maintenance--Research--United States--Abstracts.
Methadone maintenance--Research--United States--Bibliography.
Princeton subject headings:
Abstracts.
Methadone maintenance--Research--United States--Abstracts.
Methadone maintenance--Research--United States--Bibliography.