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| View Original: | Bulletin 426 Plate II B Quarries near Glen Echo.jpg (1293x918) | |||
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| Keywords: Bulletin 426 Plate II B Quarries near Glen Echo.jpg Glen Echo Maryland showing intersecting joints Photo c 1910 <br>Text from the volume describing this figure <br> Jointing both vertical and horizontal is prominently developed in the Maryland granites see Pl II A B and a third set of diagonal joints is distinct in many of the quarries 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 | ||||
