Map showing the elevation relative to sea level of the top of the Springfield Coal Member in Gibson, Pike, Posey, Warrick, and Vanderburgh Counties, Indiana (2001)
Conolly, C. L. 2001, Map showing the elevation relative to sea level of the top of the Springfield Coal Member in Gibson, Pike, Posey, Warrick, and Vanderburgh Counties, Indiana: Indiana Geological Survey Open-File Study 01-14
Notes: Publications in the Indiana Geological Survey Open-File series have been inconsistently named using a variety of series titles including "Open-File Report," "Open-File Map," and "Open-File Study." Prior to 1994, a publication in this series was generally referred to as an "Open-File Report" (but not always). To help reduce confusion created by these inconsistencies, the IGS now refers to every publication in the Open-File series as an "Open-File Study." To be entirely correct in writing a bibliographic reference for a publication, one should use the series name and number that appears on the publication itself.
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