High frequency - Wikipedia
Calling / Emergency Frequencies | Ham radio, Ham radio antenna, Emergency radio
Experimental Shortwave Radio | Interactive Art and Computational Design, Spring 2016
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Klingenfuss Shortwave Frequency Guide
Alex's updated shortwave frequency charts | The SWLing Post
Klingenfuss Shortwave Frequency Guide
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hf - Receiving shortwave frequencies from different countries (e.g. North Korea) - Amateur Radio Stack Exchange
Shortwave radio - Wikipedia
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Radio Frequencies
Shortwave Radio: Reaching Dissidents in China? Good theory, but… – MountainRunner.us
Alex's BBC World Service frequency chart | The SWLing Post
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Radio Broadcast Signals
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A Beginners Guide to Monitoring Shortwave Radio for Survival - Firearms News
Scanner and Shortwave Frequencies: Text Files - AmRRON
