Columbia subject headings:
Harvard subject headings:
America--Antiquities.
America--Civilization.
Aztecs--History
Civilization, Ancient--History.
Incas--History
Indians
Mayas--History
Princeton subject headings:
America--Antiquities.
America--Civilization.
Aztecs--History.
Civilization, Ancient--History.
Incas--History.
Indians.
Mayas--History.