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.
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32. 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.
1975. Guy, Donald E. Description based on 52. Ohio Division of Geological Survey. Includes both texts and maps. Ohio. Division of Geological Survey.
1975. Guy, Donald E. Includes both texts and maps. Description based on 52. Ohio Division of Geological Survey. Ohio. Division of Geological Survey.
1975. Guy, Donald E. Description based on 52. Includes both texts and maps. Ohio Division of Geological Survey. Ohio. Division of Geological Survey.
1975. Guy, Donald E. Description based on 52. Includes both texts and maps. Ohio Division of Geological Survey. Ohio. Division of Geological Survey.
1975. Guy, Donald E. Description based on 52. Includes both texts and maps. Ohio Division of Geological Survey. Ohio. Division of Geological Survey.
1975. Guy, Donald E. Description based on 52. Includes both texts and maps. Ohio Division of Geological Survey. Ohio. Division of Geological Survey.
1975. Guy, Donald E. Description based on 52. Ohio Division of Geological Survey. Includes both texts and maps. Ohio. Division of Geological Survey.
1975. Guy, Donald E. Includes both texts and maps. Description based on 52. Ohio Division of Geological Survey. Ohio. Division of Geological Survey.