Columbia subject headings:
Central America--Antiquities.
Indians of Central America--Commerce.
Indians of Mexico--Commerce.
Mexico--Antiquities.
Trade routes--Central America.
Trade routes--Mexico.
Harvard subject headings:
Central America--Antiquities.
Excavations (Archaeology)--Central America.
Excavations (Archaeology)--Mexico
Indian roads--Mexico--History--Congresses.
Indians of Central America--Commerce
Indians of Mexico--Antiquities--Congresses
Indians of Mexico--Commerce--Congresses.
Indians of Mexico--Commerce.
Mexico--Antiquities--Congresses.
Mexico--Antiquities.
Trade routes--Central America--History.
Trade routes--Mexico--History--Congresses.
Trade routes--Mexico--History.
Princeton subject headings:
Indian roads--Mexico--History--Congresses.
Indians of Mexico--Antiquities--Congresses.
Indians of Mexico--Commerce--Congresses.
Mexico--Antiquities--Congresses.
Trade routes--Mexico--History--Congresses.