Levin, Harvey J.  1924- <br/><br/>
The invisible resource :  use and regulation of the radio spectrum / 
by Harvey J. Levin. 
 - Baltimore :  Published for Resources for the Future by the Johns Hopkins Press,  1971. 
 - xxi, 432 p. :  illus. ;  24 cm. 
<br/><br/> Includes fold. sheet (col. illus.)'The electromagnetic spectrum' in pocket available at Cawangan Alat Pandang Dengar under the same call number. 
<br/><br/><label>ISBN: </label>0801813166 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio frequency allocation--United States.<br/>Radio--United States--Laws and legislations.