I am trying to narrow my search for my 2nd ggrandfather, John Rhodes Avery, who died in Union, SD and buried someplace in Day Co. I have a paid headstone receipt, signed by his daughter, Sarah Maria, w/ delivery instructions for Pierpont. He died in 1891. I would like to locate, or at least reduce my search, for the cemetery. I will then visit Day Co. to photograph the headstone.