Area 51 and recommended it, so when I was in the library, I looked it up. This is a book that goes inside the secret part of the Nevada desert, from the outside, using sources and much information that was recently declassified in the end of the first decade of the 2000s. Apparently the area was established in 1951, hence the name, as a part of the Nevada Test Range the government owned, as a place to secretly work on technology related to nuclear physics and the atomic bombs. The CIA took over for a long time as the area developed, and eventually the Air Force managed most of the site.
However most of this history is from the 50s and 60s, with a little in the 70s and 80s. So much is still classified, it's definitely not a complete look, but some of the stories of how nuclear work was done there, are amazing.
I don't want to talk about the book, but it's well written and well organized. There's a great section on the Roswell crash and links about what happened, as well as a little speculation. No clues other than to saw everything is man made.
Worth the read if you are interested in the history of the military and nuclear bombs.