Results: 1 - 3 of 3
Dec 31, 1975
Earth Sciences Report
… fuel for the future. … Yurko, J.R. … Yurko, J.R. (1976): Deep Cretaceous coal …
Dec 31, 1984
Earth Sciences Report
… ranks are exposed. … Nurkowski, J.R. … Nurkowski, J.R. (1985): Coal quality and rank …
Dec 31, 1979
Open File Report
… mining methods. … Nurkowski, J.R. … Nurkowski, J.R. (1980): Geology and coal …