Andrews, G.W. (1971). Early Miocene nonmarine diatoms from the Pine Ridge Area, Sioux County, Nebraska. Geological Survey Professional Paper, Contributions to Paleontology, (683-E): 1-17, 2 pls.
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Andrews, G.W.
1971
Early Miocene nonmarine diatoms from the Pine Ridge Area, Sioux County, Nebraska
Geological Survey Professional Paper, Contributions to Paleontology