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The economic value of farm manure as a fertilizer on Iowa soils
W. H. Stevenson, P. E. Brown, L. W. Forman, W. G. Baker, J. L. Boatman, W. J. B. Boatman · Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
245 sayfa · 1926
Farm manure / Economic aspects / Organic wastes as fertilizer