; [fot. por] Lynn Johnson / Robert E. Rhoades ; The world's food supply at risk
Main AuthorRhoades Robert E.Analytic: National Geographic / ed. William Graves. - Washington D.C. : National Geographic Society. - Vol. 179, Nº 4 (Abril 1991), pp. [74]-105Topical name: AGRICULTURA | ECOLOGIA AGRÁRIA CDU: 631.95
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