Crowley, Thomas H. <br/><br/>
Modern communications / 
Thomas H. Crowley [and others] 
 - New York:  Columbia University Press,  1962. 
 - 340 p. :  ill.;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.
<br/><br/><label>Dewey Class. No.: </label>621.38 CRO