Ringel, Gerhard <br/><br/>
Map color theorem. 

 - Berlin:  New York:  Springer,  1974. 
 - xii, 191 p.:  illus.,  24 cm. 
 - Grundlehren der mathematischen Wissenschaften,  Bd. 209. .
<br/><br/>Bibliography: p. [184]-187. 
<br/><br/><label>ISBN: </label>0387065482 (New York) 
<br/><br/><label>LCCN: </label>73017986 //r852 
<br/><br/><label>Nat. Bib. No.: </label>GFR*** 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Map-coloring problem.
<br/><br/><label>Dewey Class. No.: </label>514.3  / R581m