Columbia subject headings:
Harvard subject headings:
Borderlands--Latin America.
Borderlands--North America.
Borderlands--United States.
Latin America--Boundaries.
North America--Boundaries.
Territory, National--Latin America.
Territory, National--North America.
Territory, National--United States.
United States--Boundaries.
Princeton subject headings:
Borderlands--Latin America.
Borderlands--North America.
Borderlands--United States.
Latin America--Boundaries.
North America--Boundaries.
Territory, National--Latin America.
Territory, National--North America.
Territory, National--United States.
United States--Boundaries.