{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Drill-Dust Collectors Approved by the Bureau of Mines as of January 31, 1956 (Bureau of Mines Information Circular 7741)","author_name":"C. W. Owings, F. G. Anderson","thumbnail_url":"https://www.ebooknetworking.net/books/noimage.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B001UZ0XYC.html\">Drill-Dust Collectors Approved by the Bureau of Mines as of January 31, 1956 (Bureau of Mines Information Circular 7741)</a>","width":400,"height":300}