International code of signals :  for visual, sound, and radio communications united states edition / 

 - Revised Edition 2020. 
 - Springfield, Virginia :  National Geospatial-Intelligence Agency,  2020. 
 - iii, 158 pages :  illustrations ;  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Signaling Instructions.
<br/><br/><label>Dewey Class. No.: </label>623.8  / In8