Possibly the swiftest route to your roots.
Irish genealogy website directory.
www.lib.utexas.edu/maps/historical/ward_1912.html
Description:
The following maps are from "The Cambridge Modern History Atlas" edited by Sir Adolphus William Ward, G.W. Prothero, Sir Stanley Mordaunt Leathes, and E.A. Benians. Cambridge University Press; London. 1912. Users can access the index to locate place names within the atlas.