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Industrial minerals produced in Illinois in 1943;
clays and clay products, fluorspar, sand, gravel, silica sand, ground silica, tripoli, stone, cement, lime, mineral wool and agstone used in Illinois in 1943.
Preliminary report by Walter H. Voskuil and Douglas F. Stevens.

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Full view   Information circular / Illinois State Geological Survey ; [no. 111] University of Illinois at Urbana-Champaign