Columbia subject headings:
Caves--Mexico--Yucatán.
Corwith Expedition, 1895.
Mayas--Antiquities.
Yucatán (Mexico : State)--Antiquities.
Harvard subject headings:
Caves--Mexico--Yucatán (State)
Corwith Expedition, 1895.
Mayas--Antiquities
Yucatán (Mexico : State)--Antiquities.
Princeton subject headings:
Caves--Mexico--Yucatán (State).
Corwith Expedition, 1895.
Mayas--Antiquities.
Yucatán (Mexico : State)--Antiquities.