Columbia subject headings:
African Americans--Economic conditions--Bibliography.
Hispanic Americans--Economic conditions--Bibliography.
Indians of North America--Economic conditions--Bibliography.
Harvard subject headings:
African Americans--Economic conditions--Bibliography.
Hispanic Americans--Economic conditions--Bibliography.
Indians of North America--Economic conditions--Bibliography.
Princeton subject headings:
African Americans--Economic conditions--Bibliography.
Hispanic Americans--Economic conditions--Bibliography.
Indians of North America--Economic conditions--Bibliography.