About MARINO G G
About Univ. Illinois at Urbana-Champaign
About MAHAR J W
About Univ. Illinois at Urbana-Champaign
About POWELL L R
About Bureau of Mines, MN
About THILL R E
About Bureau of Mines, MN
About Information Circular. United States Department of the Interior. Bureau of Mines
About abandoned working(mining)
About Illinois
About Damage to plant and animal life
About Underground mining
About イリノイ州
About 柱
About 採炭
About 跡
About 地盤沈下
About 構造物
About 損傷