The 1931 international code of signals. 

 - American edition 
 - Washington,  U.S. Govt. Print. Off.,  1952. 
 - xvii, 418 p. 
 - U.S. Hydrographic Office. [Publication] .
<br/><br/> On cover: International code of signals (American edition) Vol. II - Radio. 1931. U.S. Navy. Hydrographic office. 
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<br/><br/><label>Dewey Class. No.: </label>358.24  / NIN