Also, Richard is at p. 45 of the Pinkham Genealogy:"Richard Pinkham of Old Dover, New Hampshire and His Descendants East and West" by Rev. Charles Nelson Sinnett (Concord, NH 1908).That works includes John Davis Pinkham.
The Pinkham Genealogy gives the incorrect male-line ancestry of Richard b. 1752.It should be Richard-1, Richard-2, Schubael-3, Richard-4, Richard-5 (b. 1752).