R. A Penfold: How to build your own PC

How to Design and Make Your Own Printed Circuit Boards (BP) By R. A. Penfold

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

Practical Electronic Model Railway Projects by R. A. Penfold (Paperback, 1996)

Single IC Projects by R.A. Penfold

Modern Optodevice Projects by Penfold, R. A. Paperback Book

Practical Electronic Model Railway Projects by R. A. Penfold

50 Projects Using IC CA3130 R.A. Penfold Bernards Babani BP223 Fifty Electronics