{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Guidelines for Permitting, Construction and Monitoring of Retention Bulkheads in Underground Coal Mines","author_name":"Samuel P. Harteis, Dennis R. Dolinar, Terence M. Taylor, Department of Health and Human Services Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health","thumbnail_url":"https://www.ebooknetworking.net/books/149/299/big149299670X.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-149299670X.html\">Guidelines for Permitting, Construction and Monitoring of Retention Bulkheads in Underground Coal Mines</a>","width":400,"height":300}