{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The use of National Bureau of Standards high frequency broadcasts for time and frequency calibrations","author_name":"N. Hironka","thumbnail_url":"https://www.ebooknetworking.net/books/B00/41K/bigB0041KJEE8.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0041KJEE8.html\">The use of National Bureau of Standards high frequency broadcasts for time and frequency calibrations</a>","width":400,"height":300}