''We procure means of seeing objects afar off, as in the heaven and remote places; and represent things near as afar off, and things afar off as near; making feigned distances.''

Radar Astronomy (Evans & Hagfors, 1968)

https://archive.org/details/RadarAstronomy

''2345 3487 3454 3455 4867 3465 4965 3452....''

Published by the N.S.A. from 1974 to 1997 - "A mix of technical, expository, philosophical, futuristic, argumentative and historical articles - with a light touch here and there - there's always an article or two to engage the reader." 

Cryptolog Technical Journal (N.S.A. 1974-1997 136 issues)

https://archive.org/details/nsacryptolog

''What the hell is he building in there? He has subscriptions to those magazines...''

73 Magazine was an amateur radio magazine that was published from 1960 to 2003.It was known for its emphasis on technical articles. ''73''  means "best regards" in amateur radio slang.

73 Magazine (Amateur Radio Today)

https://archive.org/details/73-magazine

''Whisky Tango Romeo veintiuno...'' 

                                       


''Shortwave Numbers Stations are a perfect method of anonymous, one way communication. Spies located anywhere in the world can be communicated to by their masters via small, locally available, and unmodified Shortwave receivers. The encryption system used by Numbers Stations, known as a one time pad is unbreakable. Combine this with the fact that it is almost impossible to track down the message recipients once they are inserted into the enemy country, it becomes clear just how powerful the Numbers Station system is.''

The Conet Project (IRDIAL Records, 1997)

https://archive.org/details/ird059