Hart, B. A. <br/><br/>
Local and durnal variations in ground-based radioactivity gradients at tropical locations / 
B. A. Hart, G.D. Thayer and H.T. Dougherty 
 - Washington, D.C. :  U.S. Department of Commerce,  1971 
 - iii, 65 p. ;  ill. ;  28 cm. 
 - Telecommunications research and engineering report 23 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric engineering
<br/><br/><label>Dewey Class. No.: </label>621.3