Verstappen, H. T. <br/><br/>
A geomorphological reconnaissance of Sumatra and adjacent islands (Indonesia) / 
by H. Th. Verstappen ; International Institute for Aerial Survey and Earth Sciences (I.T.C.), Enschede 
 - Groningen :  Wolters-Noordhoff Pub.,  1973 
 - 194 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references (p.174-182) 
<br/><br/><label>ISBN: </label>9001909388 
<br/><br/><label>LCCN: </label>73-180830 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomorphology--Indonesia--Sumatra