Use of computers in the coal industry 1990 :  proceedings of the fourth conference on the use of  computers in the coal industry, Morgantown, West. Virginia, 20 -22 June 1990 / 
edited by R. Larry Grayson & J. J. Wang, Richard L. Sanford 
 - 275 p. ;  25 cm. 
<br/><br/><label>ISBN: </label>9061911176 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal trade--Congresses.<br/>Computer service industry--Congresses.