Am looking for information on John C. Calvin of Jefferson and Crawford Co. listed on p.337 of Claude C. Calvin's book published in l945.I believe John originally came from Mercer Co., Pa.He had a brother Robert mentioned in his will and a nephew John.John C. was b. 1785 and d. 2/9/1848. Buried in Hartstown, Pa. cemetery.Married Nancy Andrews da. of Hugh Andrews and Mary Roll. Her grave not found but it is thought she went to Illinois with daughter Nancy who married Robert Henry. Would like to correspond with anyone working on this line.