Difference between revisions of "File:Penn carbondale 4-18.jpg"
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Latest revision as of 21:13, 26 January 2021
Figure 4-18. Map of the type area of the Colchester Coal, showing locations of the measured sections in Figure 4-19. Base map is a Colchester 7.5-minute topographic sheet, used courtesy of the U.S. Geological Survey.
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