Columbia subject headings:
Indians of Mexico--Mexico--Campeche (State)--Antiquities.
Mayas--Antiquities.
Harvard subject headings:
Excavations (Archaeology)--Mexico--Campeche (State)--Congresses.
Indians of Mexico--Mexico--Campeche (State)--Antiquities--Congresses.
Mayas--Antiquities--Congresses
Princeton subject headings:
Indians of Mexico--Mexico--Campeche (State)--Antiquities.
Mayas--Antiquities.