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| | United States Callsign Policies |
 | | 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. |
| | Stations in El Paso got W calls, even though El Paso is west of Colorado Springs and Denver, Colorado, and Laramie, Wyoming, all of which got K calls. |
| | However, according to the station lists appearing in the latter publication, it is clear that the commercial land stations were actually being issued calls in the opposite pattern, i.e. |
| earlyradiohistory.us /recap.htm (4588 words) |
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