Columbia subject headings:
Central America--Antiquities.
Mayan languages--Writing.
Mayas--Antiquities.
Mexico--Antiquities.
Harvard subject headings:
Central America--Antiquities.
Mayan languages--Writing
Mayas--Antiquities
Mexico--Antiquities.
Princeton subject headings:
Central America--Antiquities.
Mayan languages--Writing.
Mayas--Antiquities.
Mexico--Antiquities.