A guide to codes and signals : international flag code, secret ciphers, weather signals, morse code, sign language, etc., with flags of all nations / by Gordon A.J. Petersen and Marshall McClintock ...
The following article is courtesy of NOAA: Nowadays, we have radio, TV and the internet to tell us when a cold front or other weather is headed our way. In the late 19th and early 20th centuries, ...
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