I am looking for more information about this woman. She married John E Tierney and had three children in SD. I have what I am pretty sure is her death certificate and it says her parents were Tom Bergen and Mary Ryan. She was born 31 Aug 1866 in Cresco, Howard Co., Iowa and died 06 Apr 1954 in Aberdeen, Brown Co., SD. I have several names for her ranging from Maggie A Tierney to Berrigan and Bergin depending on the census or marriage certificate of two of her kids that you look at.