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Humus and Soil Nitrogen ; Climatic Studies with Wheat, Oats and Corn ; Brome and Timothy Compared ; Austrian Brome Hay

Edwin Fremont Ladd

出版	North Dakota Agricultural College, Governmental Agricultural Experiment Station for North Dakota, 1901
URL	http://books.google.com.hk/books?id=oW4pAQAAMAAJ&hl=&source=gbs_api