James L. Murphy, "The Hanover Petroglyph Site (33-Li-56), Licking County, Ohio," Ohio Archaeologist 27, no. 2 (Spring 1977): 12-15.
Abstract:
Prehistoric and historic rock carvings, since destroyed by highway construction, are described and illustrated from the Hanover or Pure Oil Petroglyph Site, 33-Li-56, Licking Co., Ohio.