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Technical conversion factors for agricultural commodities : (Provisional issue of the rev. and enl. ed. of the FAO handbook on technical conversion factors for agricultural commodities, publ. 1960. Facteurs de conversion techniques pour les produits agricoles. Manual de la FAO [Food and Agriculture Organization] sobre coeficientes y normas de conversión para productos agropecuarios)
(1972)
Argentine agriculture : trends in production and world competition
Smith, John Newton, (1968)
Crop production statistics 1940-1979
Muir, Kay, (1981)