{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"An Attempt to Determine Photovisual Magnitudes without a Colour-Filter and a Study of the Colours and the Magnitudes of the Stars in the Galactic Cluster Messier 7 and Its Surroundings. Annalen v.d. Bosscha-Sterrenwacht Lembang (Java) volume3#4","author_name":"A. Wallenquist","thumbnail_url":"https://www.ebooknetworking.net/books/B00/0IV/bigB000IVFI08.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B000IVFI08.html\">An Attempt to Determine Photovisual Magnitudes without a Colour-Filter and a Study of the Colours and the Magnitudes of the Stars in the Galactic Cluster Messier 7 and Its Surroundings. Annalen v.d. Bosscha-Sterrenwacht Lembang (Java) volume3#4</a>","width":400,"height":300}