Mitchell,Ray <br/><br/>
The Study Book Of Telegraphs 

 - London:  The Bodley Head, 
 - 48 p.;  col. ill.  21 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemical engineering and related technologies
<br/><br/><label>Dewey Class. No.: </label>620  / MIT