Ordnance Survey Great Britain One-inch Series : 7th edition.
Great Britain.Ordnance Survey.
Southampton : Ordnance Survey,
[1952-1961].
Relief shown by contour lines.
National Grid, showing National Park boundaries,  [sheets: 1-190].
includes 7th series index sheets.
refer to: C16.
refer to: 20 (R. Hellyer: 1999).