Columbia subject headings:
Harvard subject headings:
Bread--Folklore
Bread--Mexico--Folklore.
Bread--Mexico.
Corn--Social aspects--Mexico.
Food habits--Mexico.
Indians of Mexico--Food.
Indians of Mexico--Social life and customs
Mexico--Social life and customs.
Wheat--Social aspects--Mexico.
Princeton subject headings:
Bread--Mexico.
Corn as food--Mexico--History.
Corn--Folklore.
Mexico--Social life and customs.