Heck thomas J. <br/><br/>
oil exploration and development in the north dakota williston basin:1990-1991 update 
Thomas J. heck 
 - iv, :26, :ill.  Pbk 
<br/><br/><label>ISBN: </label>00781576 
<br/><br/><label>LC Class. No.: </label>TN871.2.H4 1992