Columbia subject headings:
Amazon River Region--Social conditions.
Harvard subject headings:
Human ecology--Political aspects--Amazon River Region.
Indians of South America--Amazon River Region--Politics and government.
Indians of South America--Amazon River Region--Social conditions.
Princeton subject headings:
Human ecology--Political aspects--Amazon River Region.
Indians of South America--Amazon River Region--Politics and government.
Indians of South America--Amazon River Region--Social conditions.