Skurzynski, Gloria,  <br/><br/>
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 - 64 pages :   colour illustrations ;   22 cm 
<br/><br/><label>ISBN: </label>0027780716 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication
<br/><br/><label>Dewey Class. No.: </label>621.382