File:Figure 16.jpg: Revision history

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    1 April 2016

    • curprev 19:3919:39, 1 April 2016‎ Alan.Myers talk contribs‎ 190 bytes +190‎ Fig. 16 -- Development of the stratigraphic classifications used in Illinois. The references include reports that introduced changes in the classification and others that show typical usage.
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