Columbia subject headings:
Amazon River Region--Social conditions.
Casa Arana (Firm)--History.
Indians of South America--Crimes against--Amazon River Region.
Peonage--Amazon River Region--History.
Putumayo River Region--Social conditions.
Rubber industry and trade--Amazon River Region--History.
Witoto Indians--Crimes against.
Harvard subject headings:
Casa Arana (Firm)--History.
Indians of South America--Crimes against--Amazon River Region.
Japurá River Region (Colombia and Brazil)--Social conditions.
Peonage--Amazon River Region--History.
Putumayo River Region--Social conditions.
Rubber industry and trade--Amazon River Region--History.
Princeton subject headings:
Caquetá River Region (Colombia)--Social conditions.
Indians of South America--Crimes against--Amazon River Region.
Peonage--Amazon River Region--History.
Putumayo River Region--Social conditions.
Rubber industry and trade--Amazon River Region--History.