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You searched for: Date ca. 1940-1950 Remove constraint Date: ca. 1940-1950 Topical Subjects Coal Mines and Mining--Miners at Work. Remove constraint Topical Subjects: Coal Mines and Mining--Miners at Work.
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Miners drill two or more holes into coal to place the explosive charges.

1. Drilling Prior to Setting Explosives

IDNO:
003060
Title:
Drilling Prior to Setting Explosives
Date:
ca. 1940-1950
Description:
Miners drill two or more holes into coal to place the explosive charges.