| 11. | In 1840 he joined the Ordnance Survey of Ireland as a Cork.
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| 12. | He entered the Ordnance Survey in 1882, aged 17.
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| 13. | They almost exclusively work with the AddressBase products from the Ordnance Survey.
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| 14. | Topographic maps are based on the Ordnance Survey Oxford Cartographers.
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| 15. | His main focus at Exeter was the history of the Ordnance Survey.
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| 16. | In 1920 he was employed by the Ordnance Survey.
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| 17. | The only reliable map is the Ordnance Survey :.
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| 18. | The Ordnance Survey mark a spot height of at the radio mast at.
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| 19. | The Ordnance Survey grid reference for the centre of the town is SP612645.
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| 20. | The Ordnance Survey Map of 1913 shows the area as being fully developed.
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