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Soil Survey of the Crookston Area Minnesota
A. W. Mangum
其他書名
U. S. Department of Agriculture. Bureau of Soils. By A. W. Mangum and F. C. Schroeder
出版U.S. Government Printing Office, 1907
URLhttp://books.google.com.hk/books?id=C1SOMgAACAAJ&hl=&source=gbs_api