{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Anthracite mechanical-mining investigations: Progress report 7: longhole retreat mining of a steeply pitching anthracite bed","author_name":"Andrew. Allan,","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3HK/bigB003HKRTZO.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003HKRTZO.html\">Anthracite mechanical-mining investigations: Progress report 7: longhole retreat mining of a steeply pitching anthracite bed</a>","width":400,"height":300}