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Google圖書搜尋
Lighting Practices in Coal Mines of the United States
Alva Britt Hooker
Clarence Watson Owings
出版
U.S. Department of the Interior, Bureau of Mines
, 1938
URL
http://books.google.com.hk/books?id=PeY_XOoy36cC&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
