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O.S. County Series index sheet
Full title - Ordnance Survey of England and Wales. Combined Index Showing Civil Parishes and the Ordnance Survey Maps of Caernarvonshire on the 6-inch and 25-inch scales. Surveyed 1885-88. Revised 1910-14. Partially Revised 1937-39. Parish Boundaries correct to 1-12-59. Black and red print on light yellow paper.
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