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Keywords: Geological Survey of Illinois BHL40423409.jpg Geological Survey of Illinois 40423409 124989 61379 Foldout v 6 http //www biodiversitylibrary org/page/40423409 10 5962/bhl title 61379 Illinois ; Worthen Amos Henry NOT_IN_COPYRIGHT<br> Biodiversity Heritage Library Check categories 2015 November 4 PD-old-70-1923 Geological Survey of Illinois Images uploaded by Fæ Files from the Biodiversity Heritage Library
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