Illinois State Geological Survey , University of Illinois (Urbana -Champaign campus). Dept . of Mining Engineering , University of Illinois (Urbana -Champaign campus ). Engineering Experiment Station , United States Bureau of Mines

Photo Illinois State Geological Survey ,  University of Illinois (Urbana -Champaign campus). Dept . of Mining Engineering ,  University of Illinois (Urbana -Champaign campus ). Engineering Experiment Station ,  United States Bureau of Mines
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Illinois State Geolo...

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3/5 (3)

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1 books | 0 series

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