Question: Clarence Hungerforf Webb studied which Caddoan culture sire 15 miles from the Mississippi River?
Sentence (from "Poverty Point"): Poverty Point State Historic Site (French: "Pointe de Pauvreté" ) (16 WC 5) is a prehistoric earthworks of the Poverty Point culture, now a U.S. National Monument and World Heritage Site located in the Southern United States.
Relevant evidence: No