Great Britain: Limestone.
Great Britain.Ordnance Survey.
Great Britain.Ministry of Housing and Local Government.
Great Britain.Department of Health for Scotland.
Chessington : Ordnance Survey,
1955.
"3977".
Inset: Orkney & Shetland.
"The quality of limestone in Scotland is based on Geological Survey samples analysed at the Macaulay Institute for Soil Research."
Limestone
National atlas of Great Britain.