My wife and I visited the Old Hill Burying Ground in Concord, MA this last September. We recently posted the headstone photos of the Stows in that cemetery. It includes Nathaniel and Martha (Metcalf), their son, Nathaniel, Jr. and his wife, Ruth (Merriam), their son, Joseph and wife Elizabeth, and their children, Hannah and Joseph. You can find that by doing a search in the Genealogy.com Virtual Cemetery using either "Stow" or "Old Hill Burying Ground, Concord, MA, USA." This message was also posted in the "Stow Family Genealogy Forum."