{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Review of single-entry longwall mining technology in the United States","author_name":"F. M. Jenkins","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3HK/bigB003HKQSRO.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003HKQSRO.html\">Review of single-entry longwall mining technology in the United States</a>","width":400,"height":300}