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Missouri University of Science and Technology
<p>Copper mines and mining -- Colorado -- La Plata County<br />Ore-dressing</p>
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Mining And Milling Of A Low Grade Copper Ore, Richard Edward Armstrong, Horace Asahel Johnson
Mining And Milling Of A Low Grade Copper Ore, Richard Edward Armstrong, Horace Asahel Johnson
Bachelors Theses
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