Pitkin, James A.  1931- <br/><br/>
Airborne measurements of Terrestrial radioactivity as an aid to geologic mapping / 
by James A. Pitkin. 
 -- Washington :   United States Government Printing Office,   1968 
 - 29 p. -- 
 (Geological Survey Professional Paper  ;  516-F).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geofísica
<br/><br/><label>Universal Decimal Class. No.: </label>550.3