Columbia subject headings:
Harvard subject headings:
Choctaw Indians--Economic conditions.
Choctaw Indians--Social conditions.
Human ecology--United States
Indians of North America--Economic conditions
Indians of North America--Social conditions
Navajo Indians--Economic conditions
Navajo Indians--Social conditions.
Pawnee Indians--Economic conditions.
Pawnee Indians--Social conditions.
Subsistence economy--United States.
Princeton subject headings:
Choctaw Indians--Economic conditions.
Choctaw Indians--Social conditions.
Human ecology--United States.
Indians of North America--Economic conditions.
Indians of North America--Social conditions.
Navajo Indians--Economic conditions.
Navajo Indians--Social conditions.
Pawnee Indians--Economic conditions.
Pawnee Indians--Social conditions.
Subsistence economy--United States.