| Year | 1971 |
| Date | 19-Mar |
| Volume | 137 |
| Issue | 3,413 |
| Page | 272 |
| Category | General |
| Part | 5 |
| Title | Metallurgy in Model Engineering |
| Author | M.Woodington |
| Notes | Hot working, pickling, free-cutting alloys, cutting action, achieving free-cutting properties, machining problems |