| Adolph E. Waller, Alfred Dachnowski, Bertram Whittier Wells, Edgar Nelson Transeau, Forest Buffen Harkness Brown, Frederic E. Perry, John Henry Schaffner, Lillian E. Humphrey, Ohio State University. Department of Botany, Paul Bigelow Sears, Robert Fiske Griggs, Rose Gormley - Agricultural geography - 1918 - 662 pages
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