| Welwyn Garden City Library and Information Service | Local history reference | LOC P 711.4 N.T. | Not for loan (Set: 14 Dec 2011) |
| Welwyn Garden City Library and Information Service | Local history reference | LOC P 711.4 | Not for loan (Set: 14 Dec 2011) |
| Welwyn Garden City Library and Information Service | Local history reference | LOC P 711.4 | Not for loan (Set: 14 Dec 2011) |