![]() | Great Plains Geology R. F. Diffendal Jr. is professor emeritus in the School of Natural Resources at the University of Nebraska-Lincoln. He is the author of Lewis and Clark and the Geology of the Great Plains . |
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![]() | Great Plains Geology R. F. Diffendal Jr. is professor emeritus in the School of Natural Resources at the University of Nebraska-Lincoln. He is the author of Lewis and Clark and the Geology of the Great Plains . |