Classic geological exposures, old and new, Coralville Lake and spillway :
Devonian Fossil Gorge, Merrill A. Stainbrook Preserve & Old State Quarry Preserve /
prepared by Brian J. Witzke and Bill J. Bunker.
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Item Link | Original Source |
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Limited (search only) no.60 (1994) | University of Illinois at Urbana-Champaign |