| 31. | The ordnance survey grid reference is SK 6949.
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| 32. | This is similar to the service offered in Great Britain by the Ordnance Survey.
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| 33. | He then headed the Ordnance Survey of Ireland.
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| 34. | The final map was drawn at agency headquarters and printed by the Ordnance Survey.
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| 35. | The Ordnance Survey in 1867 also recorded a Roman Catholic school in the village.
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| 36. | The Ordnance Survey map of 1875 marks the site as " Foundry Pond ".
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| 37. | For record purposes the walk starts at its original departure point, the Ordnance Survey 250px
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| 38. | Ysgyryd Fawr has belonged to the B4521 Ross Road shown on the Ordnance Survey maps.
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| 39. | He was Director-General of the Ordnance Survey in 1935, retiring in 1943.
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| 40. | Yolland left the Ordnance Survey immediately afterwards.
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