Columbia subject headings:
Amazon River Valley--Information services.
Amazon River Valley--Societies, etc.--Directories.
Rain forest ecology--Amazon River Valley--Information services.
Rain forest ecology--Amazon River Valley--Societies, etc.--Directories.
Harvard subject headings:
Amazon River Region--Environmental conditions.
Rain forests--Societies, etc.--Directories.
Princeton subject headings:
Forest conservation--Amazon River Region--Societies, etc.--Directories.
Rain forests--Amazon River Region--Societies, etc.--Directories.