{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Three coal mine ventilation studies using sulfur hexafluoride tracer gas","author_name":"Vinson, Robert P.","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3HK/bigB003HKREO0.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003HKREO0.html\">Three coal mine ventilation studies using sulfur hexafluoride tracer gas</a>","width":400,"height":300}