Não informado. (1951). FAO Fertilizer Yearbook. Food and Agriculture Organization of the United Nations.
Citace podle Chicago (17th ed.)Não informado. FAO Fertilizer Yearbook. Rome: Food and Agriculture Organization of the United Nations, 1951.
Citace podle MLA (8th ed.)Não informado. FAO Fertilizer Yearbook. Food and Agriculture Organization of the United Nations, 1951.
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