Heiland, C. A. <br/><br/>
Geophysical exploration 

 - Prentice-Hall, INC  New York  1946 
 - 1013p.  fig. 
<br/><br/><label>Nat. Bib. No.: </label>1267 
<br/><br/><label>Universal Decimal Class. No.: </label>550.81  / HEI