Admiralty Handbook of Wireless Telegraphy /  Textual Documents 
H.M.Stationery Office. 
 - 1st ed. / 
 - London :  H.M.Stationery Office ,  1938. 
 - 315p. :  ill ;  24cm . 
 - Vol. II- 
<br/><br/><label>Subjects--Index Terms: </label>Wireless Telegraphy G-Technology 
<br/><br/><label>Dewey Class. No.: </label>621.3842  / H 62 Ad