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World rubber production and trade : economic and technical aspects 1935-1939 / by C.A. Gehlsen.
- International institute of agriculture,
- 1940.
- Rome :
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World trade in agricultural products : its growth; its crisis; and the new trade policies / by L.B. Bacon and F.C. Schloemer.
- International institute of agriculture,
- 1940.
- Rome :