Columbia subject headings:
Guatemala--Antiquities--Congresses.
Mayas--Antiquities--Congresses.
Mayas--Congresses.
Mexico--Antiquities--Congresses.
Harvard subject headings:
Guatemala--Antiquities--Congresses.
Maya language--Mexico--Congresses.
Maya mythology--Congresses.
Mayas--Religion--Congresses.
Mayas--Social life and customs--Congresses.
Mexico--Antiquities--Congresses.
Princeton subject headings:
Mayas--Congresses.
Mexico--Antiquities--Congresses.