Stewart, A. C. <br/><br/>
Effect of small frequency changes on the radiation patterns of MF (AM) directional antennas / 
A. C. Stewart and J. B. Heffelfinger 
 - [S.l. :  s.n.],  1980 
 - v, 55 p. ;  27 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Frequency curves--United States<br/>Hydrology--United States
<br/><br/><label>Dewey Class. No.: </label>551.480973