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Pennsylvania Spatial Data: Devonian Siltstone Shale Assessment Unit
From the site: "The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit... -
National Assessment of Oil and Gas Project Devonian Marcellus Shale of the...
The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined...