1X1 Call Sign Database U.S. callsigns
Clover Operators Call Book - DX
Clover Operators Call Book - USA
FCC License Database U.S. callsigns
FCC Callsign Database U.S. callsigns, by University of Arkansas
HamQTH.com by Petr, OK2CQR
IK4LZH QSL Infosystem
ON6DP Database
OZ7C QSL Search Machine
Pathfinder Web Client Search country specific call books
RW1QM Multiply Database Search Includes C.I.S. E-mail addresses
SM5ARL QSL Manager and DX Address Data
World Wide HamCall Search Service by Buckmaster
World Wide Young Contesters Call Book .pdf file
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