Columbia subject headings:
Harvard subject headings:
Commerce, Prehistoric--Mexico.
Guatemala--Antiquities.
Indians of Central America--Guatemala--Antiquities
Indians of Mexico--Antiquities
Indians of Mexico--Commerce--History.
Mexico--Antiquities.
Mexico--Commerce--History.
Trade routes--Mexico--History.
Princeton subject headings:
Central America--Antiquities.
Indian roads--Central America.
Indian roads--Mexico.
Indians of Central America--Commerce.
Indians of Central America--Economic conditions.
Indians of Mexico--Commerce.
Indians of Mexico--Economic conditions.
Mexico--Antiquities.