Columbia subject headings:
Indian calendar--Central America.
Indian calendar--Mexico.
Maya language.
Mayan languages--Writing.
Mayas--Calendars.
Harvard subject headings:
Indians of Central America--Calendars.
Indians of Mexico--Calendars.
Maya calendar
Maya language
Mayan languages--Writing
Mayas--Calendars.
Princeton subject headings:
Indians of Central America--Calendar.
Indians of Mexico--Calendar.
Maya calendar.
Maya language.
Mayan languages--Writing.