Astakhov, A. Grubler, A. <br/><br/>
Resource requirements and economics of the coal-mining process: a comparative an 
/ A. Astakhov; A. Grubler 
 - Laxenburg  International institute for applied systems analysis  1984 
 - 204 p. 
<br/><br/><label>ISBN: </label>3704500690 
<br/><br/><label>Dewey Class. No.: </label>333.822  / AST