I found your post in a search for the location of the letters of the Rev. Peter Claywell. On p. 342 of Grissom's History of the Methodist Church in North Carolina, he cites: Letter written by Peter Claywell at the age of ninety, dated 1876. The letter referred to the first camp meeting in the year 1801 near Snow Creek Church in Iredell County. Grissom states, "The preaching place was at Peter Claywell's. The church which grew out of it was Snow Creek. The first camp meeting was attended by such men as Jonathan Jackson, presiding elder on the Newbern District, Philip Bruce, and Joseph Moore. "Jonathan Jackson was a powerful" preacher, says Peter Claywell, writing of him in 1876.
I am wondering if you might have any idea what repository might hold Rev. Claywell's letters.