- 'Blue Box' is linked to phone call fraud - YIPL issue 2 (July 1971) YIPL 2 - page 1
- 1972 credit card code - YIPL issue 7 (Dec-Jan 1972) YIPL 7 - page 1
- 1972 credit card code - YIPL issue 8 (Feb 1972) YIPL 8 - page 2
- 1973 credit code - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 3
- a red box in every pot - YIPL issue 19 (June 1973) YIPL 19 - page 2
- a sure cure for message units - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 2
- abbie hoffman on pay phone justice - YIPL issue 4 (September 1971) YIPL 4 - page 2
- Abbie's defense fund - TAP issue 21 (August-September 1973) TAP 21 - page 1
- all new red box - YIPL issue 16 (Feb 1973) YIPL 16 - page 1
- Allende accuses ITT in UN - YIPL issue 16 (Feb 1973) YIPL 16 - page 5
- authorisation on credit card calls - YIPL issue 16 (Feb 1973) YIPL 16 - page 3
- bell employees - YIPL issue 3 (August 1971) YIPL 3 - page 1
- black box (makes inbound long distance calls free for the caller) - YIPL issue 9 (March-April 1972) YIPL 9 - page 2
- black box for local calls - YIPL issue 20 (July 1973) YIPL 20 - page 3
- blue boxing as protest - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 1
- boycott war products - YIPL issue 11 (June-July 1972) YIPL 11 - page 3
- british phone system rigged for free calls - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 3
- build a line relay - YIPL issue 17 (March-April 1973) YIPL 17 - page 2
- build a snoop light - YIPL issue 19 (June 1973) YIPL 19 - page 2
- build a T network for fun and profit - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 2
- california test numbers - YIPL issue 14 (November 1972) YIPL 14 - page 2
- captain crunch pleads no contest - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 3
- carolina plain dealer ripoff - YIPL issue 5 (October 1971) YIPL 5 - page 2
- church withholds phone tax - YIPL issue 5 (October 1971) YIPL 5 - page 2
- code billing system - YIPL issue 8 (Feb 1972) YIPL 8 - page 1
- comments on blue box - YIPL issue 13 (Sept-Oct 1972) YIPL 13 - page 1
- comments on red box - YIPL issue 13 (Sept-Oct 1972) YIPL 13 - page 1
- Construction & Operation of the Blue Box - YIPL issue 12 (August 1972) YIPL 12 - page 2
- destructory assistance - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 2
- dialling overseas calls - YIPL issue 13 (Sept-Oct 1972) YIPL 13 - page 2
- don't get busted - YIPL issue 17 (March-April 1973) YIPL 17 - page 1
- easy to build low-cost toy organ - YIPL issue 5 (October 1971) YIPL 5 - page 1
- great subway ripoff - YIPL issue 13 (Sept-Oct 1972) YIPL 13 - page 1
- head crash - YIPL issue 19 (June 1973) YIPL 19 - page 3
- how to get out of paying deposit - YIPL issue 20 (July 1973) YIPL 20 - page 3
- how to not get caught making fake credit card calls - YIPL issue 5 (October 1971) YIPL 5 - page 2
- induction coupler - YIPL issue 8 (Feb 1972) YIPL 8 - page 1
- KP-2 - transit keypulse - YIPL issue 14 (November 1972) YIPL 14 - page 2
- LA test numbers - YIPL issue 17 (March-April 1973) YIPL 17 - page 3
- letters - YIPL issue 7 (Dec-Jan 1972) YIPL 7 - page 2
- letters - YIPL issue 11 (June-July 1972) YIPL 11 - page 1
- letters + answers - YIPL issue 5 (October 1971) YIPL 5 - page 2
- Letters to the editor - YIPL issue 1 (June 1971) YIPL 1 - page 3
- letters to the editor - YIPL issue 3 (August 1971) YIPL 3 - page 2
- letters to the editor - YIPL issue 4 (September 1971) YIPL 4 - page 2
- letters to the readers - YIPL issue 6 (November 1971) YIPL 6 - page 2
- ma bell is really pa bell in drag - YIPL issue 18 (May 1973) YIPL 18 - page 1
- mackeral recipes - YIPL issue 14 (November 1972) YIPL 14 - page 3
- mixer and amplifier for electronic organ - YIPL issue 6 (November 1971) YIPL 6 - page 2
- monkey warfare - YIPL issue 4 (September 1971) YIPL 4 - page 3
- monkey warfare - YIPL issue 19 (June 1973) YIPL 19 - page 1
- more box plans - YIPL issue 13 (Sept-Oct 1972) YIPL 13 - page 2
- more country codes - YIPL issue 14 (November 1972) YIPL 14 - page 1
- more on the black box (super-duper project) - YIPL issue 10 (May 1972) YIPL 10 - page 2
- more pay phone ripoffs - YIPL issue 6 (November 1971) YIPL 6 - page 2
- new readers - YIPL issue 12 (August 1972) YIPL 12 - page 1
- news phone : tel-com - YIPL issue 16 (Feb 1973) YIPL 16 - page 3
- no more long distance calls! - YIPL issue 18 (May 1973) YIPL 18 - page 2
- operating principles - YIPL issue 16 (Feb 1973) YIPL 16 - page 2
- Our friendly phone company - YIPL issue 1 (June 1971) YIPL 1 - page 3
- overcoming dial-lock - YIPL issue 12 (August 1972) YIPL 12 - page 3
- parking meters - YIPL issue 19 (June 1973) YIPL 19 - page 1
- pay phone scams - YIPL issue 7 (Dec-Jan 1972) YIPL 7 - page 2
- phone operator tells of ma bell's "watergate" - YIPL issue 20 (July 1973) YIPL 20 - page 2
- phone phreak's convention invitation - YIPL issue 20 (July 1973) YIPL 20 - page 2
- playing a tune for a telephone number - YIPL issue 13 (Sept-Oct 1972) YIPL 13 - page 3
- ramparts info - YIPL issue 12 (August 1972) YIPL 12 - page 1
- reader supplied information - YIPL issue 14 (November 1972) YIPL 14 - page 2
- reader supplied information - YIPL issue 15 (Dec-Jan 1972) YIPL 15 - page 2
- readers - YIPL issue 13 (Sept-Oct 1972) YIPL 13 - page 1
- reasons for name change - TAP issue 21 (August-September 1973) TAP 21 - page 1
- receive free long distance calls - YIPL issue 11 (June-July 1972) YIPL 11 - page 2
- red box phreaks! - YIPL issue 17 (March-April 1973) YIPL 17 - page 2
- remember the blue box? - YIPL issue 5 (October 1971) YIPL 5 - page 1
- scamming pay phones - YIPL issue 1 (June 1971) YIPL 1 - page 3
- special convention issue - YIPL issue 11 (June-July 1972) YIPL 11 - page 1
- special pay phone issue - YIPL issue 4 (September 1971) YIPL 4 - page 1
- stamp scam - YIPL issue 6 (November 1971) YIPL 6 - page 3
- start your own local chapter of yipl - YIPL issue 10 (May 1972) YIPL 10 - page 1
- statement of purpose - YIPL issue 3 (August 1971) YIPL 3 - page 1
- steal this book - YIPL issue 2 (July 1971) YIPL 2 - page 2
- stopping traffic - YIPL issue 10 (May 1972) YIPL 10 - page 2
- super-duper project - YIPL issue 9 (March-April 1972) YIPL 9 - page 2
- support captain crunch - YIPL issue 11 (June-July 1972) YIPL 11 - page 3
- support captain crunch - YIPL issue 14 (November 1972) YIPL 14 - page 3
- Technical Information - adding additional phones - YIPL issue 1 (June 1971) YIPL 1 - page 2
- the at&t papers - YIPL issue 14 (November 1972) YIPL 14 - page 2
- the cheese box (conference line) - YIPL issue 20 (July 1973) YIPL 20 - page 2
- The Credit Card Code - YIPL issue 1 (June 1971) YIPL 1 - page 1
- The dumbest rip-off - YIPL issue 2 (July 1971) YIPL 2 - page 2
- the private ear - YIPL issue 3 (August 1971) YIPL 3 - page 2
- the red box - YIPL issue 16 (Feb 1973) YIPL 16 - page 2
- tuning - YIPL issue 16 (Feb 1973) YIPL 16 - page 2
- tuning your organ - YIPL issue 7 (Dec-Jan 1972) YIPL 7 - page 3
- using blue box on pay phones - YIPL issue 6 (November 1971) YIPL 6 - page 1
- War Tax Resistance - YIPL issue 1 (June 1971) YIPL 1 - page 4
- we try harder - YIPL issue 18 (May 1973) YIPL 18 - page 2
- Western Electric - YIPL issue 2 (July 1971) YIPL 2 - page 3
- yipl is - YIPL issue 19 (June 1973) YIPL 19 - page 2
- yipl price change - YIPL issue 3 (August 1971) YIPL 3 - page 1
