These are extra resources for anyone who wants to do further research on numbers stations, cryptography, and shortwave radio.  The websites and archives below are excellent sources of information.  Please feel free to contact us if you have any good recommendations.

Declassified / Government Archives

The CIA Library
Contains many popular publications and documents released by the CIA.

FBI Records – The Vault
Contains scanned FBI documents that have been released for the public to view.

Ukrainian archive of declassified KGB documents. (in Ukrainian and Russian).

Mitrokhin Archive
The Mitrokhin Archive consists of summarized notes taken by Vasili Nikitich Mitrokhin, a former KGB archivist who defected to the United Kingdom after the fall of the Soviet Union.

STASI Documents
Documents of STASI the German Democratic Republic intelligence agency (in German).


Crypto Museum
The Crypto Museum is a site that focuses on preserving the history of cipher machines and has great historical info.

Secret Code Breaker
Online Cryptanalysis Handbook.

Shortwave Radio
Guide to shortwave radio listening, news and shortwave radio reviews.

Shortwave Radio World
Learning and informative recourse about shortwave radio and beyond.

University of Twente webSDR
uTwentes webSDR, a very useful wide band 0-30 MhZ radio receiver.

Signal Identification Guide
Database of various signal modes on shortwave. Sound samplesand signal waterfall images.

Numbers & Oddities
A site with interesting information about numbers stations and oddity signals.

Worldwide Map of public SDR Receivers
A list of SDR’s you can listen to that are located around the world.

Mysteries Signals of the Short Wave
Dedicated to the more unusual, strange, bizarre and apparently meaningless signals on the short wave bands!

The Conet Project Archive
Archive of the conet project, has 4 CDs of recordings.

The European Numbers Information Gathering and Monitoring Association.

Military Sources

EAM Watch
A group of HF-GCS listeners that log EAM and Skyking message activity.

Связь в Вооруженных Силах Российской Федерации
Official Russian Communications forces yearly journals. Contains information about
the leadership, developments and history of the Russian communications forces.

Russian Military Message Types and Phonetics

Radio Manual For The Armed Forces of The USSR 1965
Rukovodstvo Po Radiosvyazi Vs SSSR 1985

Youtube Channels

NSRIC’s Youtube


Peter Staal