-
Pennsylvania Spatial Data: Greater Big Sandy Assessment Unit
From the site: "Cell maps for each oil and gas assessment unit were created by the USGS as a method for illustrating the degree of exploration, type of production, and... -
Pennsylvania Spatial Data: Greater Big Sandy Assessment Unit Quarter Mile Cells
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...