Geological Survey of Great Britain. Great Britain. Geological Survey of England and Wales. Sheet 311 drift. Great Britain. Ordnance Survey of England. North Decimal Degree 51.0167. South Decimal Degree 50.8333. East Decimal Degree -2.9167. West Decimal Degree -3.3167. 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 map 21 by Sir H. T. De la Beche, C. B., F.R.S. Resurveyed on the one-inch old series map; main part by W. A.E. Ussher, south-eastern part by H. B Woodward and C. Reid,1870-75. the geology tranferred to the new series map, with additions by A. J. Jukes-Browne, 1892. Published with Drift 1906.".