Gibbs, H.J. <br/><br/>
Research studies / 
United states department of the interior 
 - Colorado :  United states department of the interior  1960 
 - 37 pages ;  Includes illustrations. 
<br/><br/> Pbk. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering properties
<br/><br/><label>Dewey Class. No.: </label>R 338.47 RES 1963