Columbia subject headings:
Harvard subject headings:
Indians of Mexico--Mexico--Mezquital Valley (Hidalgo)
Mezquital Valley (Hidalgo, Mexico)--Social conditions.
Otomi Indians.
Princeton subject headings:
Indians of Mexico--Mexico--Mezquital Valley (Hidalgo)--Social conditions.
Mezquital Valley (Hidalgo, Mexico)--Social conditions.
Otomi Indians--Social conditions.