Category:Scientific articles regarding coal bearing formations in the United States

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Subcategories

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)

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