SPY RADIO STATIONS: Cryptic Signals: MILIONE, RONALD p: 9798409550684: Amazon.com: Books
The Shortwave Radio Audio Archive
RS-59
How Numbers Stations Work | HowStuffWorks
Weird Radio and Television: A Collection of Spy Transmissions, Unidentified Stations, Paranormal Activities, and other Mysteries across the Media by Charles River Editors - Audiobook | Scribd
The ghostly radio station that no one claims to run - BBC Future
Sirius
Alpha, Kilo, Charlie: Can You Hack This Mysterious 'Mossad' Code? - Tech News - Haaretz.com
The spooky world of the 'numbers stations' - BBC News
Secret Spy Radio Stations (Number Stations): Milione, Ronald Paul: 9798562698186: Amazon.com: Books
Secrets of a Spy Station - PARI
Explaining the 'Mystery' of Numbers Stations
Second Life Marketplace - G&D VEF Russian Spy Radios
All About Those Weird “Numbers” Stations Used to Talk to Spies
Capturing the eerie voices of old spy radio broadcasts
Secret Radio Stations By The Numbers | Hackaday
Numbers stations: encoded spy messages - Audio and Sound