Index Map for England & Wales One Inch Old Series

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The Geological Survey maps of the Old Series maps were first issued in Devon in 1834-35, the rest of the West Country in 1839-50 and for the rest of England and Wales from 1848-98. The Old Series layout and numbering system for England and Wales derived from the Ordnance Survey's (OS) first edition topographic map which, beginning in 1805, reflected the priority of preparing for Napoleonic invasion and also a certain London-centricity.