Category:Marcellus Shale by U.S. state
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Subcategories
This category has the following 7 subcategories, out of 7 total.
M
- Marcellus Shale in Maryland (3 F)
N
O
- Marcellus Shale in Ohio (3 F)
P
V
- Marcellus Shale in Virginia (3 F)