Spatial Coverage
- North Atlantic Ocean1
- North Dakota.1
- North Sea1
- Northern Panhandle1
- Northern Panhandle (W. Va.)1
- Northern Panhandle.1
- Ohio County1
- Ohio County (W. Va.)1
- Ohio County.1
- Ohio.1
- Oil fields1
- Ontario1
- Pacific Coast (North America)1
- Pacific Coast (U.S. and Canada)1
- Roane County1
- Roane County (W. Va.)1
- Roane County.1
- Russia (Federation)1
- San Rafael Swell1
- San Rafael Swell.1
