Ohio. Division of Geological SurveyScale 1:12,000.by Stephen P. Reidel.TIFFhttps://hdl.handle.net/1811/f3e900b5-de69-4f0d-bc8c-6e44faacb916engPublicGeologyBedrock geology of the serpent mound cryptoexplosion structure, Adams, Highland, and Pike Counties, OhioMapsOhio--Adams CountyOhio--Highland CountyOhio--Pike CountyOhioThe Ohio State University