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Brazilian agricultural technology and trade. A study of five commodities
Knight, Peter Titcomb, (1971)
The future of agriculture in Southern Brazil : some policy projections through a dynamic regional model of the wheat region, Rio Grande do Sul (1970-1985) (Prelim. draft)
Ahn, Choon Yong, (1973)
Levantamento por amostragem da safra de trigo de 1958 no Rio Grande do Sul
Jabine, Thomas, (1959)