Helmsley Castle
| Publisher | Her Majesty's Stationery Office |
| Copyright Holder | Crown Copyright |
| Printed by | HMSO Press |
| Format | Paperback |
| Language | English |
| Location | London |
| Copyright | 1966 |
| This Impression | 1980 |
| Pages / Font | 11 pages |
| ISBN | 0 11 670156 0 |
| Price | 60p |
| Notes | Sixth impression. |
Added by steppenwolf_a_558