{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Lake Superior iron resources: Reexamination of nonmagnetic taconite occurrences in the Hibbing, Minn., area by flotation, magnetic separation, and petrographic methods (Report of investigations)","author_name":"Leonard F Heising","thumbnail_url":"https://www.ebooknetworking.net/books/B00/07F/bigB0007FPEM2.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0007FPEM2.html\">Lake Superior iron resources: Reexamination of nonmagnetic taconite occurrences in the Hibbing, Minn., area by flotation, magnetic separation, and petrographic methods (Report of investigations)</a>","width":400,"height":300}