Category:Gneiss in Pennsylvania
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Media in category "Gneiss 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) (19829069163).jpg 3,360 × 2,472; 2.82 MB
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Bulletin of the Geological Society of America (1905) (20261942818).jpg 3,744 × 2,236; 1.7 MB
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