Columbia subject headings:
Aztec calendar.
Aztec philosophy.
Aztecs--Rites and ceremonies.
Maya calendar.
Maya philosophy.
Mayas--Rites and ceremonies.
Harvard subject headings:
Aztec calendar.
Aztec philosophy.
Aztecs--Rites and ceremonies.
Maya calendar
Maya philosophy.
Mayas--Rites and ceremonies
Princeton subject headings:
Aztec calendar.
Aztec philosophy.
Aztecs--Rites and ceremonies.
Maya calendar.
Maya philosophy.
Mayas--Rites and ceremonies.