Diamond drilling of blast holes lake Superior district iron-ore mines /
by Ernest W. Johnson and Frank E. Cash.

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Main Author: Johnson, Ernest William, 1890-
Related Names: Cash, Frank E., author.
Language(s): English
Published: [Washington], [1945]
Subjects: Iron mines and mining.
Blasting.
Note: Reproduced from type-written copy.
At head of title: ... April 1945. United States Dept. of the interior ... Bureau of mines ...
Cover-title.
Physical Description: 11 p. : diagrs. ; 27 cm.
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