Looking for any information on Bertha Maxwell who died in January 1987 in Delavan, Walworth, Wisconsin. She was born January 13, 1905 in North Dakota to Grace Vivsian Sweet and Isaac Radford. Mother later marred William Ferris Salter and Bertha took the last name of Salter. Bertha married Melvin Maxwell after 1930. Any infor would be greatly appreciated.