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Fertilizer use statistics in crop production
Martinez, Adolfo, (1982)
Fertilizer use in the United States by crops and areas, 1964 estimates
Ibach, Donald Bryan, (1967)
Crop production levels and fertilizer use
Williams, Moyle S., (1962)
African seed enterprises : sowing the seeds of food security
Van Mele, Paul, (2011)
Monthly bulletin of agricultural economics and statistics
Collection FAO: la commercialisation / La commercialisation