University of Illinois Urbana-Champaign

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Thumbnail for INHS Reports, November/December 1999
INHS Reports, November/December 1999
Illinois Natural History Survey

Thumbnail for Mines in the Illinois portion of the Illinois-Kentucky Fluorspar District
Mines in the Illinois portion of the Illinois-Kentucky Fluorspar District
Denny, F. Brett; Nelson, W. John; Breeden, Jeremy R.; Lillie, Ross C.