Ordnance Survey: The Second Geodetic Levelling of England and Wales 1912-1921. Published by Order of the Ministry of Agriculture and FisheriesH.M. Stationery Office, 1922 |
Ordnance Survey: The Second Geodetic Levelling of England and Wales 1912-1921. Published by Order of the Ministry of Agriculture and FisheriesH.M. Stationery Office, 1922 |