Bell Telephone System <br/><br/>
Bell Telephone System -technical Publications Monograph Nos. B-1631, B-1622 & B-1415 

 - New York 
 - 6989p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>C3x
<br/><br/><label>Dewey Class. No.: </label>C3x  / H8