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Soil Survey of Wadena County, Minnesota

John Ambrose ElwellMark Baldwin (Soil surveyor)Joseph Henry EllisErnest August FiegerJames Singleton HallSamuel Nelson HillPaul Raymond McMillerWendell William StrikeGustavus Adolphus Swenson

出版	U.S. Government Printing Office, 1930
URL	http://books.google.com.hk/books?id=MmbQzgEACAAJ&hl=&source=gbs_api