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Google圖書搜尋
Experiments on Strength of Small Pillars of Coal in the Pittsburgh Bed
Harold Putnam Greenwald
Henry C. Howarth
Irving Hartmann
出版
U.S. Department of the Interior, Bureau of Mines
, 1939
URL
http://books.google.com.hk/books?id=2JA7i3HWtKIC&hl=&source=gbs_api
EBook
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