Shot firing in coal mines by electricity controlled from outside
By: by H.H. Clark, N.V. Breth and C.M. Means.
Contributors: Breth, N. V., joint author.; Means, Charles M., joint author.
Series: [U.S.] Bureau of mines. Technical paper; 108
Publisher: Govt. Print. Off.
Published: 1915
Place of publication: Washington
Language: eng
Number of pages: 36
Subjects: Electricity in mining.; Coal mines and mining.
Notes: At head of title: ... Department of the interior. Bureau of mines. Van H. Manning, director.
1st edition, Sept. 1915.
"Publications on mine accidents and methods of coal mining": p. 34-36.