Thirty Years of Crop Rotations on the Common Prairie Soil of Illinois

by Albert Nash Hume, Cyril George Hopkins, Edward Murray East, Eugene Davenport, John Main Trueman, John William Lloyd, Louie Henrie Smith, Rufus Chancey Obrecht, Walter Castella Coffey, Henry Lewis Rietz, James Harvey Pettit, Leonard Hegnauer, Jerome Edward Readhimer, Orlando Dorr Center · 1909

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