The Utilization of Phosphates by Agricultural Crops, Including a New Theory Regarding the Feeding Power of Plants: Volumes 32-42
Charles Josiah Galpin · Edwin Bret Hart · Edwin Broun Fred · Emil Truog · Eugene Merritt · Henry Steenbock · Irving E. Melhus · James Johnson · Lewis Ralph Jones
Jan 1914 · Agricultural Experiment Station of the University of Wisconsin
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