Hettner, Alfred Tilley, Philip, tra <br/><br/>
Surface features of the land  problems and methods of geomorphology 

 - London  Macmillan  1972 
 - xxxii, 193 p.; 20cm. 
<br/><br/><label>ISBN: </label>333006984 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomorphology<br/>Land surface development<br/>Landscape features<br/>Valleys<br/>Valleys origins