Results: 1 - 4 of 4
Dec 31, 1990
Open File Report
… Group is intersected, in the subsurface, in the 2400 to 3500 … Group is intersected, in the subsurface, in the 2400 to 3500 …
Dec 31, 1990
Open File Report
… Group is intersected, in the subsurface, in the 2500 to 4000 … Group is intersected, in the subsurface, in the 2500 to 4000 …
Dec 31, 1979
Open File Report
… be abandoned, at least in the subsurface, and the rocks be …
Dec 31, 1989
Open File Report
… Lake Coal Field. Additional subsurface geological studies, …