Ordnance Survey County Series Maps in the British Library.
| 6 inches to 1 mile (1:10560) - Bound volumes and microfiche/film on open access in the Maps Reading Room | ||||||
| Date | Vol. | Fiche | Microfilm | Edition | Sheets | Index |
| 1894-6 | 178 | 6" County Series drawer | O.S. Edition of 1894-6 | 17 | Index in volume | |
| 1919-21 | 378 | 6" County Series drawer | O.S. Edition of 1919-21 (microfiche called - 2nd Edition) | A-T | Use neighboring sheet diagram on each sheet | |
| 1938 | 379 | 6" County Series drawer | O.S. Provisional Edition (microfiche called - Rev. Edition) | A-T | Index in volume | |
| 25 Inches to 1 Mile (1:2500) - Bound volumes and microfilm on open access in the Maps Reading Room | |||||
| Date | Vol. | Edition | Sheets | Index | |
| 1869-82 | 1-2 | 1st edition. | I-XC | View Index 1031kb Use smaller roman numerals to obtain the sheet number | |
| 1891-5 | 3-5 | 2nd edition. | I-CLX | View Index 835kb Use larger Arabic numerals to obtain the sheet number | |
| 1912-14 | 6-7 | 3rd edition. | I-XIV | View Index 451kb Use numbers in top right of grid squares to obtain sheet number | |
| (1940) | 8-9 | L.C.C. Revised | I-XIV | View Index 451kb Use numbers in top right of grid squares to obtain sheet number | |
| 5 Feet to 1 Mile (1:1056) - Bound volumes and microfilm on open access in the Maps Reading Room | |||
| Date | Vol. | Edition | Index |
| 1871-6 | 10-17 | O.S. "New Series" 1st ed. | View Index 906Kb Use large roman numerals followed by small arabic numerals to obtain the sheet number (sheets II-XII) |
| 1893-8 | 18-36 | O.S. "Extended Series" | View Index 1419Kb Use large roman numerals followed by small arabic numerals to obtain the sheet number (sheets I-XVII) |
| 1894-1922 | 37-44 | Land Registry Series | View Index 1419Kb Use large roman numerals followed by small arabic numerals to obtain the sheet number (sheets I-XVI. Omits IV,V,IX,XIII) |
| 1894-1937 | 45 | O.S. Revision of 1894-1937 | View Index 1419Kb Use large roman numerals followed by small arabic numerals to obtain the sheet number (sheets VI, X only) |
| 1934-9 | 46-51 | L.C.C. Revised | View Index 1419Kb Use large roman numerals followed by small arabic numerals to obtain the sheet number (sheets II-XVI. Omits IX, XIII, XIV) |
| 1935-7 | 52 | O.S. Revision of 1935-7 | View Index 1419Kb Use large roman numerals followed by small arabic numerals to obtain the sheet number (sheets II, III only) |
