Columbia subject headings:
Harvard subject headings:
Drug control--Southwestern States.
Drug traffic--Southwestern States.
U.S. Customs Service--Corrupt practices.
United States. Immigration and Naturalization Service--Corrupt practices.
Princeton subject headings:
Drug control--Southwestern States.
Drug traffic--Southwestern States.
U.S. Customs Service--Corrupt practices.
United States. Immigration and Naturalization Service--Corrupt practices.