Unidentified photographer, 1859, [Ordnance Survey Building, Southampton], [The Report of the Committee on the Reduction of Ordnance Plans by Photography], Albumen print, Library of Congress, Geography and Maps Division, LL/44773

Unidentified photographer, 1859, [Darkroom at the English Ordnance Survey, 1859, used for copying maps], [The Report of the Committee on the Reduction of Ordnance Plans by Photography], Engraving, hand-coloured, Library of Congress, Geography and Maps Division, LL/44774