Great Britain. Ordnance Survey of England. Great Britain. Geological Survey of England and Wales. Sheet 269 drift. Geological Survey of Great Britain. North Decimal Degree 51.516700. South Decimal Degree 51.3333. East Decimal Degree -0.4167. West Decimal Degree -0.8333. 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 7 and 8 Old Seris in 1861-2. Drift added 1871 and 1887. Re-surveyed on the six-inch scale; N.E. corner (London District Map) by T. I. Pocock in 1902; remainder by H. Dewey and C. N. Bromehead in 1910-11.".