Columbia subject headings:
Indians of Mexico--Mexico--Chiapas--Languages--Revival.
Indians of Mexico--Mexico--Oaxaca (State)--Languages--Revival.
Harvard subject headings:
Indians of Mexico--Chiapas--Languages--Revival.
Indians of Mexico--Oaxaca (State)--Languages--Revival.
Princeton subject headings:
Indians of Mexico--Mexico--Chiapas--Languages--Revival.
Indians of Mexico--Mexico--Oaxaca (State)--Languages--Revival.