JProc's TEMPEST page gathers declassified history around compromising emanations, including wartime teletype leakage, Cold War countermeasures, monitor eavesdropping, and the security problem created when electronics radiate information they were never meant to transmit.
Fourmilab reconstructed the public-domain 1977 third edition of The Effects of Nuclear Weapons into a chapter-by-chapter web index covering blast, thermal radiation, fallout, EMP, structural damage, radio effects, and biological consequences.
The Ark Two Community documented a 10,000-square-foot Ontario fallout shelter built around 42 buried school buses, complete with maps, construction photos and recovery plans.
Ed Thelen started his site in 1996 and spent decades turning firsthand Nike missile experience, manuals, photographs, veteran recollections, and engineering notes into a public Cold War reference library.