International records / UK National Archives
NIGERIA 1:50,000 MAMBILLA NORTH Sheets 214, 215 & 235, (D.O.S. 430) ; progress folder : authority for mapping, letters, diagrams, general material, map materials, reports, sheet history.
CCS/DOS/297/10 | The Charles Close Society Archives Catalogue.Ordnance Survey International.
No file is held for this record yet. The catalogue entry and the link to where it was published are kept.
