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Atlas of Illinois Resources: Mineral resources

University of Illinois (Urbana-Champaign campus). Department of GeographyUniversity of Illinois at Urbana-Champaign. Department of Geography

出版	State of Illinois, Department of Registration and Education, Division of Industrial Planning and Development, 1958
URL	http://books.google.com.hk/books?id=c4hNAQAAIAAJ&hl=&source=gbs_api