Columbia subject headings:
Harvard subject headings:
Amazon River Region--Economic conditions--Congresses.
Amazon River Region--Economic policy--Congresses.
Indians of South America--Amazon River Region--Economic conditions--Congresses.
Land use--Amazon River Region--Congresses.
Princeton subject headings:
Amazon River Valley--Economic conditions.
Human ecology--Amazon River Valley.
Land settlement--Amazon River Valley.
Land use--Amazon River Valley.
Regional planning--Amazon River Valley.