Origianl one-inch Geological Survey published on Old Series Sheets 52 in 1863 and 1864, revised 1871. Surveyed on the six-inch scale in 1939-1950 by V. Wilson, S.E. Hollingworth, R.H. Hoare, G. Bisson, T.H. Whitehead, A.W. Woodland, W.D. Evans and W.B. Evans. T.H. Whitehead and H.G. Dines, District Geologists. Reconstituted from the one-inch scale with partial revision of the NW corner by E.G. Poole in 1963, in the Nene Valely and adjacent areas by A. Horton in 1975, and west of easting455 by J. Brewster and M.G. Sumbler in 1977, and K. Ambrose in 1979.
Published 1960. Reprinted onto 1st series 1:50 000 base 1980. Reprinted 1990.. Print code: 1250/90.