Gramly, R.M., Funk, R.E., 1991. Olive Branch: A Large Dalton and pre-Dalton Encampment at Thebes Gap, Alexander County, Illinois, in: McNutt, C.H. (Ed.), The Archaic Period In The Mid-South, Proceedings Of The 1989 Mid-South Arhcaeological Conference, Memphis, Tennessee. Mississippi Department of Archives and History, pp. 23-34.