The Northern Line Extensions
| Publisher | London Underground Railway Society |
| Periodical Title | Underground News |
| Publisher Series | No. 599 Supplement |
| Printed by | The Ludo Press |
| Format | Paperback |
| Language | English |
| This Edition Published | 2011-11 |
| Pages / Font | 80 pages |
| ISSN | 0306-8617 |
| Price | £8.95 |
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