Columbia subject headings:
Harvard subject headings:
Drug abuse--Arizona--Phoenix.
Drug abuse--New Mexico--Albuquerque.
Drug abuse--Texas--El Paso.
Heroin abuse--Arizona--Phoenix.
Heroin abuse--New Mexico--Albuquerque.
Heroin abuse--Texas--El Paso.
Princeton subject headings:
Drug abuse--Arizona--Phoenix.
Drug abuse--New Mexico--Albuquerque.
Drug abuse--Texas--El Paso.
Heroin abuse--Arizona--Phoenix.
Heroin abuse--New Mexico--Albuquerque.
Heroin abuse--Texas--El Paso.