The Tyrone Tithe Applotment was in 1834. The Tyrone Ordnance Survey Maps were made in the 1830's and released in 1840. The Tyrone Griffith's Valuation was 1864. The Lot #'s on the Griffith's Val. match the Ordnance Maps. Do the #'s on the Tithe match the Ordnance Maps? The Kerry Tithe has a colb. for "Map Ref.#", the Tyrone Tithe does not. Is that because they recorded the Info by Map Lot #?