{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Placer mining in the western United States: part II. Hydraulicking, treatment of placer concentrates, and marketing of gold","author_name":"Gardner, E. D.","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3Z4/bigB003Z4JIHO.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003Z4JIHO.html\">Placer mining in the western United States: part II. Hydraulicking, treatment of placer concentrates, and marketing of gold</a>","width":400,"height":300}