Columbia subject headings:
El Salvador--Antiquities.
Indians of Central America--El Salvador--Zapotitán Valley--Antiquities.
Mayas--Antiquities.
Volcanoes--El Salvador.
Zapotitán Valley (El Salvador)--Antiquities.
Harvard subject headings:
El Salvador--Antiquities.
Indians of Central America--El Salvador--Zapotitán Valley--Antiquities.
Mayas--Antiquities
Volcanoes--El Salvador
Zapotitán Valley (El Salvador)--Antiquities.
Princeton subject headings:
El Salvador--Antiquities.
Indians of Central America--El Salvador--Zapotitán Valley--Antiquities.
Mayas--Antiquities.
Volcanoes--El Salvador.
Zapotitán Valley (El Salvador)--Antiquities.