Barczak, Thomas M. <br/><br/>
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) .
<br/><br/><label>LCCN: </label>90001917  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine roof control.<br/>Longwall mining.