National Grid sheet lines

Geological Survey of Great Britain (England and Wales)
1:10,560 (six inches to one mile), mapped area 18.5" by 18.5", flat sheets in nice clean condition.
Published 1958-1962.
Black lines and lettering refer to geology, grey Ordnance Survey base map with brown contours.

SK 35 NE South Wingfield
SK 36 NE, NW, SE Clay Cross, Hasland
SK 37 NE, NW, SE, SW Chesterfield
SK 45 NE, NW Alderton, Somercotes
SK 46 NE, NW, SE, SW North Wingfield, Stanton Hill
SK 47 NE, NW, SE, SW Bolsover, Brimington, Stavelley
SK 48 SE, SW Mosborough, Killamarsh

£8 each plus postage at cost