Penner, R. C.,  1956- <br/><br/>
Combinatorics of train tracks / 
by R.C. Penner with J.L. Harer. 
 - Princeton, N.J. :  Princeton University Press,  1992. 
 - xi, 216 p. :  ill. ;  25 cm. 
 - Annals of mathematics studies ;  no. 125 .
<br/><br/>Includes bibliographical references (p. 214-216). 
<br/><br/><label>ISBN: </label>0691087644 (alk. paper) :  $55.00 0691025312 (pbk. : alk. paper) :  $22.50 
<br/><br/><label>LCCN: </label>91-033559 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geodesics (Mathematics)<br/>CW complexes.<br/>Combinatorial analysis.
<br/><br/><label>LC Class. No.: </label>QA649  / .P38 1991 
<br/><br/><label>Dewey Class. No.: </label>511/.6