{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Economic benefits of systematic roof bolting in Ziegler No. 3 Mine, Bell & Zoller Coal & Mining Co., Williamson County, Ill.","author_name":"L. W. Kelly","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3HK/bigB003HKQQFS.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003HKQQFS.html\">Economic benefits of systematic roof bolting in Ziegler No. 3 Mine, Bell &amp; Zoller Coal &amp; Mining Co., Williamson County, Ill.</a>","width":400,"height":300}