BioStor
 | New Paleocene mammals from the Fort Union of Montana George Gaylord Simpson (1935) Proceedings of The United States National Museum 83: 221-244 |
 | The Fort Union of the Crazy Mountain Field, Montana and its Mammalian faunas (1937) Bulletin United States National Museum 169: 1-287 |
 | A further contribution to the Dragon Paleocene fauna of Central Utah (1939) Journal of The Washington Academy of Sciences 29: 273-286 |
 | Paleocene primates from the shotgun member of the Fort Union Formation in the Wind River Basin, Wyoming C L Gazin (1971) Proceedings of The Biological Society of Washington 84: 13-37 |