Permissible electric lamps for miners / by H.H. Clark.
|Main Author:||Clark, H. H. b. 1876.|
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1914
Electric lamps, Portable.
At head of title: . . . Department of the interior. Bureau of mines. Joseph A. Holmes, director.
On verso of t.-p.: . . . First edition. February, 1914.
"Publications on mine accidents and methods of mining" p. 19-21.
21 p. :
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