University of Illinois Urbana-Champaign

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Showing 31–60 of 1,073 items
Thumbnail for Neogene grabens in southernmost Illinois
Neogene grabens in southernmost Illinois
Nelson, W. John; McBride, John H.

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.