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Google圖書搜尋
Determination and Discussion of the Spectral Classes of 700 Stars, Mostly Near the North Pole
Gerrit Hendrik ten Bruggen Cate
出版
Gebroeders Hoitsema
, 1920
URL
http://books.google.com.hk/books?id=pIbnAAAAMAAJ&hl=&source=gbs_api