Geological Survey of Great Britain. Great Britain. Geological Survey of England and Wales. Sheet 271 drift. Great Britain. Ordnance Survey of England. North Decimal Degree 51.4833. South Decimal Degree 51.3167. East Decimal Degree 0.4167. West Decimal Degree 0.0000. 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 6, Old Series, 1864, 1868. Drift added 1864-1889. Re-surveyed on the six-inch Scale; Essex by T. I. Pocock, 1902 and H. G. Dines, 1921; the remainder by Henry Dewey and C. E. N. Bromehead, 1913, 1914, 1920, and 1921.".
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