Gray, Dwight E. <br/><br/>
Man and his physical world 

 - 4th ed 
 - Toranto  D. Van Nostrand Company  1966 
 - ix,664p 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>500.2 GRA