Vintage 1912 Coal Mining - Explosive Mine Gases Chart & Coal Calculation Chart

Description

Vintage 1912 charts - Explosive Mine gases and Tons of Coal calculation chart
Vintage charts printed on very heavy duty paper stock, put out by Coal Age in 1912.  Includes Diagram of Explosive Mine Gases chart, and table/chart to calculate the amount of coal at the surface, as well as under one acre of surface area at various pitches.
Winning bidder to pay .00 for shipping & handling.
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