The USG's dusty crates full of old secrets - those of them that have been released under FOIA, anyway - may be opened by the public at a non-commercial website called The Government Attic. Feel free to rummage.
governmentattic.org provides electronic copies of hundreds of interesting Federal Government documents obtained under the Freedom of Information Act. Fascinating historical documents, reports on items in the news, oddities and fun stuff and government bloopers, they're all here.
Regarding the Freedom of Information Act, I had long been under the impression that the law was passed around the time of the Church Committee, but now I see that it was passed a decade earlier, in 1966. So the 60s were good for something after all.