Guth, Hans P. <br/><br/>
Our world today. / 
by Hans P .Guth. 
 - Lexington, Mass. :  D. C. Heath and Co.,  1981. 
 - 626 p. :  ill. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/><label>LC Class. No.: </label>PN 523  / G85 1981