YIPL No.15 (December 1972-January 1973)
High "E" is 2637 Hz, Sure Cure for Message Units, Build a "T"
network for Fun & Profit, Destructory Assistance, 1973 Credit Card
Code, British System Rigged for Free Calls, etc.
To download the file locally instead of viewing it here (or if you can't view it here but really love your antique browser), CLICK HERE to get the PDF.