Others may have already discovered this, but the Galway Library site now allows you to search information from O'Donovan's field name books--http://places.galwaylibrary.ie/ You can search by townland and get useful information (though the amount varies) on the proprietor, agent, number of tenants, quality of the land, and prevailing names. Since the books were compiled in the 1830s, they help bridge the gap between the Tithes and Griffith's. Diane