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- OS 18 1969-1970 Ordnance Survey: Directorate of Field Survey: Cambridge Radio Telescope Observations Details
- OS 19 Ordnance Survey: Directorate of Field Survey: Refractive Index Experiment: Records. Details
- OS 20 Ordnance Survey: Trigonometrical and Levelling Divisions: Pre-Cyclic Levelling: Records Details
- OS 21 Ordnance Survey: Directorate of Field Survey: Robbins Geoidal Section: Field Books Details
- OS 22 Ordnance Survey: Directorate of Field Survey: Geodetic Connections to Ireland and the Continent: Records. Details
- OS 34 1853-1866 Ordnance Survey: Directorate of Field Survey: Original Name Books Details
- OS 35 1896-1938 Ordnance Survey: Directorate of Field Survey: 25-Inch Scale Object Name Books Details
- OS 50 1951-1970 Ordnance Survey: Directorate of Field Survey: One-Inch Scale Name Books (Seventh Series) Details
- OS 52 1948-1975 Ordnance Survey: Directorate of Field Survey: One-Inch Scale Name Books (Seventh Series and Implemenation of Continuous Revision) Details
- OS 54 1874-1991 Ordnance Survey: Trigonometrical and Levelling Divisions: Levelling Books and Abstracts Details
- OS 55 1951-1968 Ordnance Survey: Trigonometrical and Levelling Divisions: Levelling Final Values Details
- OS 56 1840-1968 Ordnance Survey: Trigonometrical and Levelling Divisions: Levelling Heighter Lists Details
- OS 57 1951-1993 Ordnance Survey: Trigonometrical and Levelling Divisions: Levelling Maps and Diagrams Details
- OS 67 1943-1983 Ordnance Survey: Directorate of Field Survey: National Grid Object Name Books Details
- OS 69 1935-2008 Ordnance Survey: Trigonometrical and Levelling Divisions: Triangulation Stations, files Details
- OS 17/1 Hampshire: detail levelling 1865 Details
- OS 17/2 Hampshire: detail levelling 1866 Details
- OS 17/3 Hampshire and Wiltshire: detail levelling 1866 Details
- OS 17/4 Nottingham: town levelling 1879 Details
- OS 17/5 Winchester, Dorking, Chertsey and Petersfield: town levelling 1869 Details
- OS 17/6 Hampshire: branch levelling [1863] Details
- OS 17/7 Bridgwater to Tavistock: initial levelling 1883 Details
- OS 17/8 Lyme Regis to Southampton: initial levelling and branch levelling 1862 Details
- OS 17/9 Cornwall: initial levelling [1878-1879] Details
- OS 17/10 Hampshire: initial levelling [1864] Details
- OS 17/11 Somerset: branch levelling 1887 Details
- OS 17/12 Tavistock, Dartmouth, Bideford, Barnstaple and Totnes: town levelling 1882-1886 Details
- OS 17/13 Merionethshire and Montgomeryshire: branch levelling 1885 Details
- OS 17/14 Yorkshire: initial levelling 1888 Details
- OS 17/15 Yorkshire: initial levelling 1888 Details
- OS 17/16 Darlington and environs: town levelling and initial levelling Undated Details
- OS 17/17 Darlington and environs: town levelling and initial levelling Undated Details
- OS 17/18 Hartlepool and environs: town levelling and initial levelling Undated Details
- OS 17/19 Scarborough and Middlesbrough: town levelling 1891-1892 Details
- OS 17/20 Stockton-on-Tees: town levelling 1891-1892 Details
- OS 17/21 Cornwall and Devon: branch levelling 1883 Details
- OS 17/22 Devon and Somerset: initial levelling 1883-1884 Details
- OS 17/23 Devon: branch levelling 1883-1884 Details
- OS 17/24 Devon: branch levelling 1883-1884 Details
- OS 17/25 Devon and Somerset: branch levelling 1884-1885 Details
- OS 17/26 Montgomeryshire, Radnorshire and Cardiganshire: branch levelling 1884-1885 Details
- OS 17/27 Devon: branch levelling 1864-1867 Details
- OS 17/28 Carmarthenshire: branch levelling 1884-1885 Details
- OS 17/29 Towns in Dorset and Somerset: town levelling and branch levelling 1885-1887 Details
- OS 17/30 Devon: branch levelling 1885-1886 Details
