Columbia subject headings:
Harvard subject headings:
Amazon River Region--Environmental conditions.
Amazon River Valley--Environmental conditions.
Amazon River Valley--Social conditions.
Dams--Environmental aspects--Amazon River Region.
Economic development--Environmental aspects--Amazon River Region.
Reporters and reporting--Brazil--Amazonas.
Princeton subject headings:
Amazon River Region--Environmental conditions.
Dams--Environmental aspects--Amazon River Region.
Economic development--Environmental aspects--Amazon River Region.