Geological Survey of Great Britain. Great Britain. Geological Survey of England and Wales. Sheet 256 drift. Great Britain. Ordnance Survey of England. North Decimal Degree 51.666700. South Decimal Degree 51.5000. East Decimal Degree 0.0167. West Decimal Degree -0.4000. 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 Sheets 1 and 7, Old Series, 1961-1868. Drift added 1871 to 1876. Re-surveyed on the six-inch scale: in part by A. C. G. Cameron and J. A. Howe 1898 to 1902, and A. H. Noble 1911; revised and completed by C. E. N. Bromehead et al, 1912 to 1922.".
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