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| | United States Callsign Policies |
 | | The date of the changeover to the new three-letter radio calls wasn't stated in the 1911 annual report, however, an October 25, 1912 General Letter from the Department of Commerce and Labor later referred to "the call letters assigned to American ship stations on July 1, 1912, by the Bureau of Navigation". |
| | Finally, as of the 1933 list, with the widespread adoption of radio, the visual signal assignments were eliminated as no longer needed, although ships that had radio transmitters were now instructed they could employ their radio callsigns for signal letter purposes. |
| | In the July, 1928 Radio Broadcast magazine, Broadcast Station Calls With a Past by William Fenwick reviewed a few land stations, including broadcasters WSB Atlanta and KLZ Denver, which received calls that became available with the demise of the ships that had used them. |
| earlyradiohistory.us /recap.htm (4588 words) |
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