Bells Labs has been involved in telecommunications since the dawn of the telephone, and along the way many interesting technologies have come out from behind their doors.

Now, it is possible to download the entire catalogue of the a href=””>Bell System Technical Journal in PDF format.

The journal ran from 1922 until 1983, which means the majority of the information contained in the journal is hopelessly outdated, but it still can prove very interesting reading, especially if you are interested in historical technology.