About WEISS E S
About Bureau of Mines, U. S. Dep. Interior, Pennsylvania
About SAPKO M J
About Bureau of Mines, U. S. Dep. Interior, Pennsylvania
About BAZALA E M
About Bureau of Mines, U. S. Dep. Interior, Pennsylvania
About Oil Shale Symposium Proceedings
About oil shale
About Mine fire,explosion and gas
About ANFO
About 油母頁岩
About 採掘
About 粉塵爆発
About 評価