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

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

How to Build Your Own PC (Babani computer books) By R. A. Penfol

Getting the Most from Your Multimeter (BP) By R. A. Penfold

R.A. Penfold - Build Your Own PC / Design and Make PCBs / Fibre-Optic Projects

Build Your Own Computer: The Complete Step-by-step Manual to Constructing a PC T

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

How to Build Advanced Short Wave Receivers, Penfold, R. A., 1977 Paperback