Ordnance Survey Great Britain 1:25,000 Series : Explorer.
Great Britain.Ordnance Survey.
Southampton : Ordnance Survey,
1997-
Relief shown by contours and spot heights; also shown by landform drawings on some sheets.
Refer to: Map.Area.C16(17).
Various editions:  A, A1, A2, & revisions.
National grid.
Sheets numbered: OL1-OL45 (holdings in database) and 101-470 (holdings for nos. 101-308 in slip index, nos. 309-470 Scotland & England, north east in database).