There are currently over 3,000 ham radio links in 79 categories on the North Jersey DX Association website. We would appreciate if you add additional links.
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Callsign server at UALR using FCC database (updated DAILY). (845,737 viewings)
DB0SDX QSL Databases (845,727 viewings)
ES-Callbook Online (Up-To-Date) (845,729 viewings)
Europe - C.I.S. Callsign Server (845,722 viewings)
Europe - callbook (845,722 viewings)
Europe - CQ Callbook - Online Internet Callbook (845,722 viewings)
Europe - Guernsey callbook (845,722 viewings)
Europe - ON-Callbook (845,722 viewings)
Europe - Polish Callbook (845,722 viewings)
Europe - Qsl manager and dx addresses lookup (845,722 viewings)
Europe - Searchable Norwegian Callbook (845,722 viewings)
Europe - VHF-DX Database with calls and locators (845,722 viewings)
Finnish Callbook 1997 (845,727 viewings)
International CallSign Prefix Allocations (845,735 viewings)
One-by-One callsign database (845,726 viewings)
Pennsylvania - K3PD World of Ham Radio Callbook (845,722 viewings)
QRZ Home Page (845,734 viewings)
QSL information by IK4LZH (845,728 viewings)
SM5ARL QSL information (845,726 viewings)
US, Canadian and International Callbook (845,722 viewings)
Virginia - Callbook CDROM for Linux and Windows (845,722 viewings)
WM7D's Callsign Database (845,727 viewings)