I know this site has been mentioned here in the past but it's particularly relevant for campaigns in the USA so here it is again!
A Secret Landscape: America's Cold War Infrastructure: -
https://coldwar-c4i.net/
Plus, a book recommendation: -
Cold War: Building for nuclear confrontation 1946-1989
I don't have any ISBN for it but it was published in 2005. The authors were Wayne D. Cocroft, Roger C. Thomas & P. S. Barnwell
There's some more specific info on the Historic England website: -
https://historicengland.org.uk/image...ions/cold-war/