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| Author | : | Logan, W.N. |
| Year of publication | : | 1898 |
| Title | : | The invertebrates of the Benton, Niobrara and Fort Pierre Groups. |
| Journal | : | University Geological Survey of Kansas |
| Vol/No/Pages/Plates | : | 4: 431-518, 35 pls. |
| Published in | : | Topeka, Kansas |