Pick up a copy of the book “Spycraft” on Amazon and you’ll know everything you want to know about the numbers site. Plus it is an outstanding book about many of the techy things that the Agency developed while we were sleeping.
There were some true patriots keeping us safe. As well as details about Russian citizens who gave their lives helping us against the Soviets. Here’s a link to the book on Amazon. http://www.amazon.com/Spycraft-History-Spytechs-Communism-Al-Qaeda/dp/0452295475
And no I didn’t write it but I was a consumer of their products for the eight years I served AF Project Checkmate in the Pentagon.
Thanks! I’ll check it out.