Clarence Hungerforf Webb studied which Caddoan culture sire 15 miles from the Mississippi River?
Clarence Hungerford Webb: Clarence H. Webb (25 August 1902 - 18 January 1999) was an American medical doctor and archaeologist who conducted extensive research on prehistoric sites in the southeastern United States. Poverty Point:  It is 15.5 mi from the current Mississippi River, and situated on the edge of Maçon Ridge, near the village of Epps in West Carroll Parish in northeastern Louisiana.
i don't know