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

Easy PC Upgrading (BP) By R. A. Penfold

Easy PC Upgrading (BP)-R. A. Penfold

Circuit Source: Bk. 2 (BP S.) - Penfold, R. A. 1990s Paperback *C

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

Practical Electronic Building Blocks Book 2 by R.A. Penfold Paperback - RARE

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

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