Several people informed me of some good news this weekend: the Bell System Technical Journal is finally on-line! You can browse it and get pdf full text at: http://bstj.bell-labs.com
Visitors to the documents page of my web site know that the BSTJ was the source of a bunch of phone phreak knowledge during the 1960s -- including the seminal November 1960 article, "Signaling Systems for Control of Telephone Switching."
BSTJ's absence from the web has long been a mystery (and, honestly, a frustration) to me. I'm glad that it's finally available. The site appears a bit slow right now, but maybe that's the result of years of pent-up demand? :-)
(Thanks to Koos, Alex, Richard, Michael, Albert, and several others for the emails sharing this great news!)