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Google圖書搜尋
Progress Report
Harold Putnam Greenwald
Henry C. Howarth
Irving Hartmann
其他書名
Experiments on Strength of Small Pillars of Coal in the Pittsburgh Bed
出版
U.S. Department of the Interior, Bureau of Mines
, 1941
URL
http://books.google.com.hk/books?id=SLxcGml9M7QC&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN