HERBERT ,T.E. <br/><br/>
TELEGRAPHY  
T E.HERBERT 
 - LONDON   SIR ISAAC PITMAN AND SONS LTD   1926 
 - 1019PAGES 
<br/><br/> PE mean Physics, Electricity and Magnetism Page 450-456 in A to Z Register (Acc. No. Pe1-Pe205) 
<br/><br/><label>Dewey Class. No.: </label>PE120