Category:Washington Coal
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This category has the following 2 subcategories, out of 2 total.
Media in category "Washington Coal"
The following 2 files are in this category, out of 2 total.
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Bituminous Coal (Washington Coal, Upper Pennsylvanian).jpg 3,251 × 1,610; 3.44 MB
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Bulletin of the Geological Society of America (1917) (19826833104).jpg 2,496 × 1,736; 782 KB