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Google圖書搜尋
Comparative Researches on the Variation of the Constituents of Coal of One Seam from South Limburg (the Netherlands)
Gerrit Roos
出版
Van Aelst Bros.
, 1935
URL
http://books.google.com.hk/books?id=pwrOAAAAMAAJ&hl=&source=gbs_api