Hi! I'm so many years late on this thread, but I thought I'd drop in. I'm a descendent of Abraham Southard through his son Isaac down to my great grandmother Vernessa Ada Southard which is where the name ends in my family. I do have possible burial information for Isaac. Last summer my uncle and I were doing some "field research" and stumbled upon a small cemetery off the side of the road just outside of Pittsfield in Somerset County, Maine. Isaac's wife Diana's grave is clearly marked and next to it is an 1812 Veteran Marker with an American flag. You can just barely see a stone above the tops of the grass which may have been a crude marker for Isaac. I contacted the folks in the records office who said they don't have burial records that far back. That all being said, it may be very hard to track down or happen upon a grave for Abraham Southard which is an absolute shame. Since it's been a few years, if anyone has an update, I'd be thrilled to hear anything! Thanks!