Author of Exploding The Phone here, thanks for the mention and glad you enjoyed it! One thing I did that I'm pretty proud of is that I put almost all the research documents that I dug up (FOIA, newspaper articles, etc.) up on my website, where you can dig through them. E.g.: http://explodingthephone.com/search.php?q=blue+box&sort=rele... (please pardon the lack of https!) And to the other commenter about Evan Doorbell's excellent tapes about phone phreaking: I was lucky enough to get Evan to narrate the Audible version of my book!