Boost Your PC's Performance By R. A. Penfold

An Introduction to PIC Microcontrollers (BP) By R. A. Penfold

Practical Midi Handbook by R. A. Penfold Paperback Book The Fast Free Shipping

Power Supply Projects, R. A. Penfold Bernard Babani BP76

Getting the Most from Your Multimeter (BP), R.A. Penfold, Used(Paperback, 1988)

Computers and Music: An Introduction,R. A. Penfold- 978187077532

How to Build a Computer Made Easy-R. A. Penfold