1980. Struble, Richard A. Base map: USGS Cleveland, Ohio; Pa., U.S., Ont., Can. (4th ed. 1972 rev.) "Areal density of photo linears occurring within a 5000 meter square grid... Ohio. Division of Geological Survey.
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1980. Struble, Richard A. Base map: USGS Cleveland, Ohio; Pa., U.S., Ont., Can. (4th ed. 1972 rev.) "Areal density of photo linears occurring within a 5000 meter square grid... Ohio. Division of Geological Survey.
1980. Struble, Richard A. "Areal density of photo linears occurring within a 5000 meter square grid." Base map: USGS Cleveland, Ohio; Pa., U.S., Ont., Can. (4th ed. 1972 rev... Ohio. Division of Geological Survey.
1980. Struble, Richard A. Base map: USGS Cleveland, Ohio; Pa., U.S., Ont., Can. (4th ed. 1972 rev.) "Areal density of photo linears occurring within a 5000 meter square grid... Ohio. Division of Geological Survey.
1980. Struble, Richard A. Title assigned by cataloguer. prepared ... by Richard A. Struble and David A. Hodges. "Areal density of photo linears occurring within a 5000 meter... Ohio. Division of Geological Survey.
1980. Struble, Richard A. Title assigned by cataloguer. prepared ... by Richard A. Struble and David A. Hodges. "Areal density of photo linears occurring within a 5000 meter... Ohio. Division of Geological Survey.
467. Seneca County
1919. Cowen, Clinton. Scale approximately 1:126,720. 1 in. = 2 miles. Scale approximately 1:88,000. 1 in. = 4 miles. "Copyright 1919 by Clinton Cowen, State Highway Comm... Printing Commission of Ohio.
2003. Ohio. Division of Geological Survey. Relief shown by shading and gradient tints. Map of geologic regions, with text, on verso. Scale 1:2,000,000. 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.