Transistors and Crystal Diodes: What They Are and How To Use Them by B R Bettridge
1963. 3rd Edition. 72 pages. This is an ex-Library book. Blue and white plain paperback. Pages are lightly tanned and thumbed at the edges, with creased corners and foxing. Binding has remained firm. Paper cover is moderately rub worn and thumbed with noticeable shelf wear to edges and corners, creases to corners and spine. Moderate tanning to spine and edges.