Gray, Dwight E. <br/><br/>
Man and his physical world   
by Dwight E. Gray, John W. Coutts. 
 - 4th 
 - New Jersey  D.Van Nostrand Company, Inc.  1942 
 - ix, 663p. 
<br/><br/><label>LCCN: </label>58-8613 
<br/><br/><label>Dewey Class. No.: </label>500.2  / N661