Report of the Geological Survey of Ohio: pt. I (1873) Geology. Historical sketch ; Physical geography of Ohio ; Geological structure of Ohio, Silurian and Devonian systems ; Geology of Cuyahoga and Summit countriesGeological Survey of Ohio
Report of the Geological Survey of Ohio: pt. I (1873) Geology. Historical sketch ; Physical geography of Ohio ; Geological structure of Ohio, Silurian and Devonian systems ; Geology of Cuyahoga and Summit countries