Columbia subject headings:
Amazon River Region--Economic conditions.
Amazon River Region--Social conditions.
Bolivia--Economic conditions.
Bolivia--Social conditions.
Harvard subject headings:
Amazon River Region--Economic conditions.
Amazon River Region--Social conditions.
Bolivia--Economic conditions.
Bolivia--Social conditions.
Brazil nut industry--Amazon River Region.
Brazil nut industry--Bolivia.
Migrant labor--Amazon River Region.
Migrant labor--Bolivia.
Rubber industry and trade--Amazon River Region.
Rubber industry and trade--Bolivia.
Rubber tappers--Amazon River Region.
Rubber tappers--Bolivia.
Princeton subject headings:
Brazil nut industry--Amazon River Region.
Brazil nut industry--Bolivia.
Rubber industry and trade--Amazon River Region.
Rubber industry and trade--Bolivia.
Rubber tappers--Amazon River Region.
Rubber tappers--Bolivia.