{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Placer mining in the western United States: part III. Dredging and other forms of mechanical handling of gravel, and drift mining","author_name":"Gardner, E. D.","thumbnail_url":"https://www.ebooknetworking.net/books/B00/42A/bigB0042AM6F6.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0042AM6F6.html\">Placer mining in the western United States: part III. Dredging and other forms of mechanical handling of gravel, and drift mining</a>","width":400,"height":300}