Columbia subject headings:
Harvard subject headings:
Hevea--Brazil--History.
Hevea--Diseases and pests--Brazil--History.
Hevea--Diseases and pests--History.
Hevea--History.
Rubber industry and trade--Brazil--History.
Rubber industry and trade--History.
Princeton subject headings:
Hevea--Brazil--History.
Hevea--Diseases and pests--Brazil--History.
Hevea--Diseases and pests--History.
Hevea--History.
Rubber industry and trade--Brazil--History.
Rubber industry and trade--History.