here is a very recent recording of the telegraph station CWA
(Tony Paredes, 2008)
Verification letter from 1983 (Michael Oexner)
...from 1999 (Vladimir Rozhkov)
...and a very recent one from 2008 (Gabriel Schwartz)
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Callsigns:
CWA
Frequencies Morse Telegraphy:
421.5
500
4346
6435.5
8602
12750
16871.3
17230
22694