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Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 240, part 3
Chert Gravel and Neogene Drainage in East-central Kansas--Fig. 9

Fig. 3. Study area showing rivers and principle physiographic regions. In this study, the Arkansas River Lowlands and the Wellington-McPherson Lowlands are treated as one region.

Kansas Geological Survey
Web version March 18, 1998