Coal Surface Mine
Inga Spence
Surface Coal Mine
Inga Spence
Surface Coal Mine #1
Inga Spence
Asbestos Mine, Swaziland
Ray Ellis
Coal Mine, Arizona
Richard W Brooks
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Brian Brake
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Charlie Ott
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Charlie Ott
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C.r. Sharp
Molybdenum Mine, Idaho
Theodore Clutter
Coal Surface #1
Inga Spence
Open-pit Iron Ore
Phillip Hayson
Morenci Copper
Charlie Ott
Engineer With Coal Sample
Inga Spence
Strip Mining #1
Allyn Baum
1920s Osgood Mine Steam Shovel
Millard H. Sharp
1838 Cornish Steam Engine
Millard H. Sharp
Bituminous Coal Cleaning Plant
Theodore Clutter