{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Yieldable steel arches and yieldable steel ring supports in metal mines","author_name":"Nils A. Eilertsen","thumbnail_url":"https://www.ebooknetworking.net/books/B00/30T/bigB0030T1H6Y.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0030T1H6Y.html\">Yieldable steel arches and yieldable steel ring supports in metal mines</a>","width":400,"height":300}