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| View Original: | Bulletin 426 Fig 13 Section Philadelphia quarries.jpg (783x189) | |||
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| Keywords: Bulletin 426 Fig 13 Section Philadelphia quarries.jpg en Figure 13 Original Caption Section at Philadelphia quarries near Richmond VA showing relations between the blue and gray granites 1910 Granites of the Southeastern Atlantic States Bulletin 426 United States Geological Survey Government Printing Office Washington 1910 Watson Thomas Leonard other versions PD-USGov Geology Quarrying | ||||
