Columbia subject headings:
Harvard subject headings:
Mayas--Antiquities--Congresses
Mayas--Implements--Congresses.
Stone implements--Central America--Congresses.
Stone implements--Mexico--Congresses.
Stone implements--Mexico.
Princeton subject headings:
Indians of Mexico--Antiquities--Congresses.
Mayas--Antiquities--Congresses.
Mayas--Implements--Congresses.
Mexico--Antiquities--Congresses.
Stone implements--Mexico--Congresses.