BOOKQUE

Permissible Explosives Tested Prior to March 1, 1915
Spencer P. Howell
· 1915
Permissible Explosives, Mining Equipment and Apparatus Approved Prior to January 1, 1923
Spencer P. Howell , Lee C. Ilsley , Dorsey J. Parker , Arno Carl Fieldner
· 1923
Investigations of Explosives Used in Coal Mines
Clarence Hall , Walter Otheman Snelling , Spencer P. Howell
· 1912
Investigations of Explosives Used in Coal Mines
Clarence Hall , Walter Otheman Snelling , Spencer P. Howell
· 1912
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Permissible Explosives Tested Prior to January 1, 1917, by Spencer P. Howell
Spencer P. Howell
· 1917
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Magazines and Thaw Houses for Explosives, by Clarence Hall and Spencer P. Howell
Spencer P. Howell , Clarence Hall
· 1912
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The Selection of Explosives Used in Engineering and Mining Operations, by Clarence Hall and Spencer P. Howell
Spencer P. Howell , Clarence Hall
· 1913
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Investigations of Fuse and Miners'squibs, by Clarence Hall and Spencer P. Howell
Spencer P. Howell , Clarence Hall
· 1912
Bulletin 59. Department of the Interior Bureau of Mines. Investigation of Detonators and Electric Detonators
Spencer P. Howell , Clarence Hall
· 2017
No image available
Tests of Permissible Explosives, by Clarence Hall and Spencer P. Howell
Spencer P. Howell , Clarence Hall
· 1913