{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Terrestrial magnetism: Magnetic declination in California and Nevada in 1927","author_name":"U.S. Coast and Geodetic Survey., .","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3TQ/bigB003TQKTA8.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003TQKTA8.html\">Terrestrial magnetism: Magnetic declination in California and Nevada in 1927</a>","width":400,"height":300}