James L. Murphy, "Full- and Three-quarter-grooved Axes from the Bob Evans Shelter, Gallia County, Ohio," Ohio Archaeologist 29, no. 3 (Summer 1979): 15-16.
Two grooved axes (one full-grooved and one three-quarter-grooved) were excavated in the Late Archaic level of Bob Evans Rockshelter, Rio Grande, Gallia Co., Ohio. A radiocarbon date of 2860 B.C. +300 -320 years was obtained on charcoal from this level.