Cameron, Eugene N.,  <br/><br/>
At the crossroads 

 - xvii, 320 pages :   illustrations ;   25 cm 
<br/><br/><label>ISBN: </label>0471839825 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources - United States.
<br/><br/><label>Dewey Class. No.: </label>333.850973