Radiotelegraphy and radiotelephony :  Republic of Panama National Merchant Marine examination System. 

 - Panama :  [s.n.],  [n.d.]. 
 - 172p. :  illus. ;  28cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Boat radio.
<br/><br/><label>LC Class. No.: </label>VM 325  / R32