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Google圖書搜尋
Falls of Roof and Coal in Mines Operating in the Sewickley Coal Bed in Monongalia County, W. Va
James Washington Paul
John Nicholas Geyer
出版
U.S. Government Printing Office
, 1932
URL
http://books.google.com.hk/books?id=CtTtkCVCVyYC&hl=&source=gbs_api
EBook
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