Communication. 

 - 48p.: col. ill.    28cm. -- (Golden Books Children Cyclopedia) 
<br/><br/><label>ISBN: </label>978-1-60346-233-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communications engineering.
<br/><br/><label>Dewey Class. No.: </label>621.382 C734 2012