Columbia subject headings:
Aztec astronomy.
Aztec calendar.
Aztec cosmology.
Mexico--Antiquities.
Harvard subject headings:
Aztec astronomy.
Aztec calendar.
Aztec cosmology.
Central America--Antiquities.
Indian calendar--Central America.
Indian calendar--Mexico.
Indians of Central America--Antiquities
Indians of Mexico--Antiquities
Mexico--Antiquities.
Princeton subject headings: