Saaty, Thomas L. <br/><br/>
The four-color problem :  assaults and conquest / 
Thomas L. Saaty and Paul C. Kainen. 
 - New York :  McGraw-Hill International Book,  1977. 
 - ix, 217 p. : 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0070543828 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Four-color problem.
<br/><br/><label>Dewey Class. No.: </label>511.5  / Fo