1993. Hull, Dennis N. 1948-. Includes descriptive index to roadside geological features. Scale approximately 1:750,000. "Publication date: 5/93." by Dennis N. Hull. Panel title... Ohio. Division of Geological Survey.
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1993. Forsyth, Jane L. 1921-. compiled by Jane L. Forsyth, C. Scott Brockman, and Richard P. Goldthwait. Depths shown by bathymetric isolines. Includes legend, text, location ma... Ohio. Division of Geological Survey.
1993. Hull, Dennis N. Includes legend, text, location maps and primary data source maps. compiled by Dennis N. Hull. Scale 1:250,000 Depths shown by bathymetric isolines. Ohio. Division of Geological Survey.
1993. Goldthwait, Richard P. 1911-1992. Includes legend, text, location maps and primary data source maps. compiled by Richard P. Goldthwait and Robert G. Van Horn. Scale 1:250,000 Depths... Ohio. Division of Geological Survey.
1993. Hansen, Michael C. Scale not given. Panel title. by Michael C. Hansen. Text, satellite image of southern Ohio and 2 block diagrams. "Publication date: 8/93.". Ohio. Division of Geological Survey.
6. Regional bedrock geology of the Ohio portion of the Piqua, Ohio-Indiana 30 x 60 minute quadrangle
1993. Schumacher, Gregory A. Includes bibliographical references. Adhesive "Revision" label affixed at end of bibliography. by Gregory A. Schumacher ; Lisa Van Doren and Michae... Ohio. Division of Geological Survey.