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- 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
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- Subseries within OS 50 Index Details
- Subseries within OS 50 Authorisation Sheet for Names Details
- OS 50/24 Unknown Undated Details
- OS 50/45 Dumfriesshire Authorisation Sheet for Names not produced for this sheet 1953 Jun 17-1953 Jun 17 Details
- OS 50/91 Unknown Undated Details
- OS 50/97 Unknown Undated Details

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