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