Request from Sir George Airy for a copy of 'Report of the Progress of the Ordnance Survey', with a reply from the Secretary of H.M. Office of Works, 1876.
Letter from Sir George Airy to Col. Clarke R.E. requesting a contour map of the Malvern Hills, with a letter of rejection, 1877.
Correspondence relating to the death of General Cameron, 1878.
Correspondence relating to the retirement of Col. Clarke, 1881.
Cuttings from 'The Times' relating to the Ordnance Survey, 1892.
Proposals by Close and Hills for the re-measurement of the geodetic area of the United Kingdom, 1904.
Letter from Col. Johnstone concerning the Ordnance Survey re-observing their primary triangulation, with a reply from W.H.M. Christie, 1904.
Letter to the Admiralty expressing concern over the lack of effort shown during the re-triangulation, with a reply and acknowledgement from the Ordnance Survey Office, 1904.