| Author's List |
| title | creator | language | description | tableOfContents | contributor | subject | created |
| On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331. | Wortman, Jacob Lawson | en | Leptarctus primus; Paleontology -- Miocene; Paleontology -- Nebraska | 2008-09-05 |