| 11. | Grissom appears on the Grissom U . S . Geological Survey Map.
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| 12. | The mill was marked on the first 6 " Ordnance Survey map.
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| 13. | It appears on the Noxen U . S . Geological Survey Map.
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| 14. | Dancyville appears on the Dancyville U . S . Geological Survey Map.
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| 15. | Leavenworth appears on the Leavenworth U . S . Geological Survey Map.
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| 16. | Chesapeake appears on the Cheriton U . S . Geological Survey Map.
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| 17. | Gertrude appeared on West Virginia Geological Survey maps as late as 1929.
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| 18. | Wheelockville appears on the Blackstone U . S . Geological Survey Map.
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| 19. | Ordnance Survey maps remain in copyright for fifty years after their publication.
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| 20. | However, an early Ordnance Survey map names it as a castle site.
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