Columbia subject headings:
Harvard subject headings:
Customs administration--Mexico.
Customs administration--Texas.
Mexico--Commerce.
Texas--Commerce.
Transportation and state--Mexico.
Transportation and state--Texas.
Transportation--Mexico
Transportation--Texas.
Princeton subject headings:
Infrastructure (Economics)--Mexico.
Infrastructure (Economics)--United States.
Mexico--Boundaries--United States.
Mexico--Commerce--United States.
Transportation--Mexico.
Transportation--United States.
United States--Boundaries--Mexico.
United States--Commerce--Mexico.