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1. Geologic Unit Text Labels: Geology of the Conterminous United States, 2005
2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile contains text labels (for display purposes) of the geologic line coverage in the United States. This layer is part of the Geolo... Geological Survey (U.S.).
2. Geologic Units (Lines): Geology of the Conterminous United States, 2005
2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of geologic units within the United States. This layer is part of the Geologic Map of the United States, ori... Geological Survey (U.S.).
3. Geologic Units (Polygons): Geology of the Conterminous United States, 2005
1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This polygon shapefile shows the boundaries of geologic units within the United States. This layer is part of the Geologic Map of the United States... Geological Survey (U.S.).
4. Geologic map of Iowa.
Iowa Geological Survey.
5. Geological highway map of the northern Great Plains region North Dakota, Nebraska, South Dakota, Iowa, Minnesota /
Bennison, A. P. American Association of Petroleum Geologists,.
6. Jordan aquifer of Iowa
Horick, Paul J. Iowa Geological Survey,.
7. Mississippian aquifer of Iowa
Horick, Paul J. Iowa Geological Survey,.
8. The Maquoketa Formation (Upper Ordovician) in Iowa
Parker, Mary Combs. Iowa Geological Survey,.