It appears Robert T. died 12 May 1869 in Blooming Praire, Steele County MN. Once you get to the Cemetery, which is named Blooming Prairie City Cemetery, the entries are by day on the left side, so scroll down to "12." I found it by looking at the free Ancestry search which blanked out everything except 1869 but attributed the Cemetery Inscription database to Dalby which is a free database so I looked it up, found the cemetery name and then searched in Google for the cemetery. Dalby has lots of things but not anything for my "mystery" Minnesotans!