{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Vertical magnetic noise in the voice frequency band within and above coal mines","author_name":"John. Durkin","thumbnail_url":"https://www.ebooknetworking.net/books/B00/41K/bigB0041KKY2Y.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0041KKY2Y.html\">Vertical magnetic noise in the voice frequency band within and above coal mines</a>","width":400,"height":300}