Barczak, Thomas M.
Comparison and models to evaluate in situ shield loading / by Thomas M. Barczak and David E. Schwemmer. - Washington, DC : Bureau of Mines, U.S. Dept. of the Interior, 1990. - ii, 68 p. : ill. - Report of investigations . - Report of investigations (United States. Bureau of Mines) .
90001917
Mine roof control.
Longwall mining.
Comparison and models to evaluate in situ shield loading / by Thomas M. Barczak and David E. Schwemmer. - Washington, DC : Bureau of Mines, U.S. Dept. of the Interior, 1990. - ii, 68 p. : ill. - Report of investigations . - Report of investigations (United States. Bureau of Mines) .
90001917
Mine roof control.
Longwall mining.