Great Britain. Ordnance Survey of England. Great Britain. Geological Survey of England and Wales. Sheet 257 drift. Geological Survey of Great Britain. North Decimal Degree 51.666700. South Decimal Degree 51.5000. East Decimal Degree 0.4333. West Decimal Degree 0.0167. In upper left margin: Ordnance Survey of Great Britain. Relief shown by contour interval and spot heights. Transverse Mercator projection. National grid system. "Original Geological Survey on the one-inch scale published on Sheet 1 Old Series 1868. Drift added, 1871 to 1876. Re-surveyed on the six-inch scale in part by T. L. Pocock and J. Allen Howe in 1903; revised and completed by H. G. Dines and F. H. Edmunds, 1922 to 1923. Minor emendments by S. Buchan.".