County Tyrone Ireland, Genealogy and Family History Notes by Irish Genealogical Foundation (only part of this book is online and a good old map of Tyrone showing the baronies of Strabane, Dungannon, Clogher, Omagh geographical division that can prove helpful when researching your family in older records as page 10 indicates. Also can search for names in surname index http://books.google.com.au/books?id=kdPn7JappCkC