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Bitmap Image  |  1999-09-22  |  169.3 KB  |  596x289  |  8-bit (29 colors)
   ocr: The National Grid reference system provides a single map reference system for the whole of Great Britain. It has been overprinted on Ordnance Survey maps since the 1940s, allowing you to pinpoint any place in Great Britain. The National Grid Reference for a place or feature is unique, and will always be the same no matter which map or scale you are using (but you must always quote the National Grid letters as well as the numbers).