Columbia subject headings:
Amazon River Region--Social conditions--Congresses.
Harvard subject headings:
Amazon River Region--Antiquities--Congresses.
Amazon River Region--Social conditions--Congresses.
Indians of South America--Amazon River Region--Antiquities--Congresses.
Princeton subject headings:
Amazon River Region--Social conditions--Congresses.
Amazon River Valley--Social conditions--Congresses.
Amazonas (Peru : Region)--Social conditions--Congresses.
Indians of South America--Peru--Amazonas (Region)--Social conditions--Congresses.