{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Investigation of longwall gateroad roof support characteristics at Powhatan No. 4 Mine : instrumentation plan","author_name":"G. J. Chekan","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3HK/bigB003HKREHC.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003HKREHC.html\">Investigation of longwall gateroad roof support characteristics at Powhatan No. 4 Mine : instrumentation plan</a>","width":400,"height":300}