| 41. | By 1881 it had 1353 people and 1891 people, according to the Ordnance Survey.
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| 42. | The Ordnance Survey map reference is SE3321NW.
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| 43. | The content and locations of the archive are comprehensively described at The Ordnance Survey International Collection
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| 44. | The Ordnance Survey Ortho map dated 1995 seems to show underlying structures in the soil.
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| 45. | It also features in a'list of lists'on the Ordnance Survey blog.
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| 46. | They were included on the nineteenth-century maps of the Ordnance Survey of Ireland.
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| 47. | :" Image produced from the Ordnance Survey Get-a-map service.
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| 48. | Tinhead is labelled on the Ordnance Survey map of 1945 but not on the 1958 map.
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| 49. | Here he met the engineer Bryan Donkin, and also Colonel Colby of the Ordnance Survey.
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| 50. | "' Randerside "'was first recorded by the Ordnance Survey in 1867.
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