{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Observations of the magnetic dip: Made at several positions, chiefly on the south-western and north-eastern frontiers of the United States, and of the ... of the American Philosophical Society)","author_name":"J. D Graham","thumbnail_url":"https://www.ebooknetworking.net/books/B00/08B/bigB0008B5E5M.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0008B5E5M.html\">Observations of the magnetic dip: Made at several positions, chiefly on the south-western and north-eastern frontiers of the United States, and of the ... of the American Philosophical Society)</a>","width":400,"height":300}