Columbia subject headings:
Central America--Antiquities--Congresses.
Mayas--Antiquities--Congresses.
Mayas--Congresses.
Mexico--Antiquities--Congresses.
Palenque Site (Mexico)--Congresses.
Harvard subject headings:
Central America--Antiquities--Congresses.
Mayas--Antiquities--Congresses.
Mayas--Congresses.
Mexico--Antiquities--Congresses.
Palenque Site (Mexico)--Congresses.
Princeton subject headings: