I am searching for the full name of Frank Keller's wife. Frank was born 11/25/1847 in Bavaria and died 1/3/1916 in St. Louis, Missouri. His wifes first name is Margaret and she was born 1852 in Germany. They had to have been married between 1870 and 1880. In the 1870 census, Frank is single and living in Carondelet, St. Louis, Missouri. In 1880 he is married to Margaret and living in St. Louis, Missouri.Any help is appreciated! Thank you.