Ordnance Survey of Great Britain [cartographic material] : one inch to one mile map (seventh series)

Various eds. GSGS. Topographic map series of Great Britain, as published by the Ordnance Survey as its Seventh Series, overprined with a military grid. Relief shown by contours and spot heights.; Each sheet is named and numbered individually.; Includes index to adjoining sheet.; See R. Hellyer, 1999, 'Ordnance survey small-scale maps: indexes 1801-1998', Kerry : David Archer, entry 20.M.1.2, p. 64