{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Gyroscopic compasses (v.1-7): a course in twenty-one assignments for use of electrician's mates","author_name":"United States. Bureau of Naval Personnel.","thumbnail_url":"https://www.ebooknetworking.net/books/B00/8QN/bigB008QNR628.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B008QNR628.html\">Gyroscopic compasses (v.1-7): a course in twenty-one assignments for use of electrician&#039;s mates</a>","width":400,"height":300}