Helbling Robert <br/><br/>
Studies in photogeology in connection with geological mapping in Switzerland specially of the Todi Range...,tr.by N.E.Odell. 
Helbling Robert 
 -  1949 
<br/><br/><label>Standard No.: </label>34707 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GEOGRAPHY
<br/><br/><label>Dewey Class. No.: </label>U18:M95u594M:N5, H9