I know this message is really old, but I just noticed something, in regard to the Creggan, Mucklagh address. I was raised in Screggan Tullamore county offaly which is next to Mucklagh Tullamore County Offaly. So I would suggest looking for Dooners in the Irish Census records of 1901/1911. Offaly was formerly Kings County so the records may be under that name. I don't recall Dooner families in Screggan in the 70's and 8o's. Screggan is 4 miles from Tullamore on the Birr road. Parish name is RAHAN.