Frey, J. D., Brown, S. E., Bleuer, N. K. 1996, Database map of the southern Lake Michigan rim: Indiana Geological Survey Open-File Study 96-16
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.
Scale, 1:100,000, 9-page map explanation.
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