Area 51
An Uncensored
History of America's Top Secret Military Base
By Anne Jacobson.
Worth reading.
The Author was on National Public Radio. (NPR)
Here a link to the Radio program broadcast on May 17th 2011
http://www.npr.org/2011/05/17/136356848/area-51-uncensored-was-it-ufos-or-the-ussr