File:Figure D-3A.jpg: Revision history

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    4 April 2016

    • curprev 18:2118:21, 4 April 2016ILSTRAT talk contribs 188 bytes +188 Fig. D-3A -- Middle Devonian Limestone (Lingle and Grand Tower) in ridge ("the Backbone") along the Mississippi River north of Grand Tower, Jackson County (from Worthen, 1868, opp. p. 61).