Call sign - Wikipedia
ship radio callsign system pre and post 1912
48th Call Numbers
Common Security Guard/Police call signs
Demystifying Amateur Radio Callsigns | Hackaday
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TR CB Radio Group Call Sign Member... - Ranger Communications | Facebook
Maritime call sign - Wikipedia
Amateur Radio Callsigns Explained - Ham Radio Q&A - YouTube
Radio call signs-Inverness Forest District1998
CB Radio 10-Codes – Cardboard America™
ITU Callsign Prefixes - Resource Detail - The DXZone.com
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US available callsigns - Resource Detail - The DXZone.com
Callsigns
Call Sign Variations | NewHams.info
Call Sign: Most Up-to-Date Encyclopedia, News & Reviews
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Personalized Amateur Radio Call-Sign with On Air Radio – Mountain View Wood Works
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Ham Radio Call Signs – Ham Radio Prep
A Guide About The Radio Alphabet Call Signs | Midland Radio
FM 24-19: Radio Operator's Handbook - Chptr 5 Operating Procedures
Amateur Radio Call Signs - SARCNET
Who's that on the Radio? Creating Your Ham Identity – Icom America Inc.
