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Use of Reflector Buttons for Danger, Warning, Direction, and Safety Signs in Mines
Franklin E. Griffith
H. J. Van der Veer
出版
U.S. Department of the Interior, Bureau of Mines
, 1937
URL
http://books.google.com.hk/books?id=dv_GFh1TXBkC&hl=&source=gbs_api
EBook
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