| Revision of the Paleozoic systems EO Ulrich Bulletin of the Geological Society of America 22 (1), 281-680, 1911 | 383 | 1911 |
| Palaeozoic Bryozoa EO Ulrich Geological Survey of Illinois, 283-688, 1890 | 274 | 1890 |
| A classification of the toothlike fossils, conodonts, with descriptions of American Devonian and Mississippian species EO Ulrich, RS Bassler Proceedings of the United States National Museum, 1926 | 271 | 1926 |
| American paleozoic bryozoa EO Ulrich Journal of the Cincinnati Society of Natural History 5 (3), 121-175, 1882 | 266 | 1882 |
| Ozarkian and Canadian brachiopoda EO Ulrich, GA Cooper Geological Society of America, 1938 | 193 | 1938 |
| The Lower Silurian Gastropoda of Minnesota, in Geology of Minnesota EO Ulrich Final Rept. 3, 813-1081, 1897 | 149 | 1897 |
| Paleozoic Ostracoda: their morphology, classification and occurrence EO Ulrich, RS Bassler Maryland Geological Survey, Silurian 9, 271-391, 1923 | 145 | 1923 |
| The Lower Silurian Lamellibranchiata of Minnesota EO Ulrich | 134 | 1894 |
| New genera and species of Ozarkian and Canadian brachiopods EO Ulrich, GA Cooper Journal of Paleontology, 616-631, 1936 | 124 | 1936 |
| New American Paleozoic Ostracoda. Notes and descriptions of Upper Carboniferous genera and species EO Ulrich, RS Bassler Proceedings of the United States National Museum, 1906 | 105 | 1906 |
| Lower Silurian Bryozoa EO Ulrich | 105 | 1893 |
| Cambrian bivalved Crustacea of the order Conchostraca EO Ulrich, RS Bassler Proceedings of the United States National Museum, 1931 | 94 | 1931 |
| A revision of the paleozoic bryozoa. Part 1 EO Ulrich, RS Bassler Smithsonian Miscellaneous Collections, 1903 | 87 | 1903 |
| Ozarkian and Canadian cephalopods: part III: Longicones and summary EO Ulrich Geological Society of America, 1943 | 86* | 1943 |
| New American Paleozoic Ostracoda. Preliminary revision of the Beyrichiidae, with descriptions of new genera EO Ulrich, RS Bassler Proceedings of the United States National Museum, 1908 | 83 | 1908 |
| New and little known American Paleozoic ostracoda EO Ulrich Elm St. Print. Company, 1890 | 83 | 1890 |
| The Cambrian of the Upper Mississippi Valley EO Ulrich, CE Resser, R Ruedemann (No Title), 1930 | 76 | 1930 |
| Ordovician trilobites of the family Telephidae and concerned stratigraphic correlations EO Ulrich Proceedings of the United States National Museum, 1930 | 76 | 1930 |
| Fossiliferous Boulders in the Ouarchita" Caney" Shale and the Age of the Shale Containing Them EO Ulrich | 73 | 1927 |
| Descriptions of new genera and species of fossils from the Lower Silurian about Cincinnati EO Ulrich J. Barclay, 1879 | 66 | 1879 |
G. Arthur Cooper (1902-2000)Dept. Paleobiology, National Museum of Natural History, Smithsonian InstitutionVerified email at si.edu
