About BHASKAR R
About Pennsylvania State Univ., PA, USA
About RAMANI R V
About Pennsylvania State Univ., PA, USA
About JANKOWSKI R A
About US Bureau of Mines, PA, USA
About Mining Engineering (Englewood, Colo.)
About respirable dust
About airway(mine)
About Mine ventilation
About Mine labor environment
About 通気坑道
About 粉塵
About 実験的研究