Harbird, Isham, Brinkley Corbitt

Looking for documents to prove the following line
Isham---Harbird---James
Isham b. 1777 SC
Harbird b. 1802SC
James b 1854 GA

Huxford's Pioneers of Wiregrass Georgia gives the line in Vol II, and it is generally accepted as correct.All of my family papers agree that it is correct. (James is my GG grandfather and was personally known by my grandmother.)

However, I am trying to locate proof documents for DAR.Does anyone out there know of anything?