| Abbots Langley Library | Adult non-fiction | 791.433409 | Available |
| Berkhamsted Library | Adult non-fiction | 791.433409 | Available |
| Hemel Hempstead Library | Adult non-fiction | 791.433409 | Available |
| Oxhey Library | Adult non-fiction | 791.433409 | Available |
| St Albans Library | Adult non-fiction | 791.433409 | Available |
| Stevenage Central Library | Adult non-fiction | 791.433409 | Available |
| Tring Library | Adult non-fiction | 791.433409 | Available |
| Watford Central Library | Adult non-fiction | 791.433409 | Available |
| Welwyn Garden City Library and Information Service | Adult non-fiction | 791.433409 | Available |