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Scientific articles regarding coal bearing formations in the United States
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This category has the following 4 subcategories, out of 4 total.
S
Scientific articles mentioning the Guelph Formation
(1 C, 24 F)
Scientific articles mentioning the Lake de Smet Coal
(2 F)
Scientific articles mentioning the Pottsville Formation
(24 F)
Scientific articles mentioning the Washington Formation (geology)
(1 C)