Franklin, John A. <br/><br/>
Elementary mathematical macroeconomics 
David A. Bowers, Robert N. Baird. 
 - USA  McGraw-Hill  c1991 
 - 431p.:  ill.;  24cm 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0070218897 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rock excavation<br/>Rock mechanics