Category:Gabbro in Pennsylvania
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Media in category "Gabbro in Pennsylvania"
The following 2 files are in this category, out of 2 total.
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Bulletin of the Geological Society of America (1905) (20263325939).jpg 1,900 × 3,872; 1.96 MB
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Bulletin of the Geological Society of America (1905) (20423754696).jpg 1,856 × 3,788; 1.26 MB
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