US Federal Government agencies ...
The RR forum for this topic can be found here
Also see the MT Fed Files Blog for more information
Non classified frequencies can sometimes be found on the NTIA website
For the listings below - "TX Freq" is the transmit freq of field units (mobiles, portables, control stations, etc) - "RX Freq" is the receive freq of field units
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A Federal Frequencies QTH.net group can be found here
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The following 199 pages are in this category, out of 308 total.