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The NSA has declassified Technical Journal articles ’56–’73. Of the 29 articles they’ve listed, only 7 are working links—the other 22 are 404s.

Working: “About NSA,” “Antipodal Propagation,” “Did Aleksandr Popov Invent Radio?”, “Book Review: Lost Languages,” “Book Review: Lincos, Design of a Language for Cosmic Intercourse, Part 1,” “Aristocrat—An Intelligence Test for Computers,” and “Extraterrestrial [...]