BioStor
 | A review of the Middle and Upper Eocene primates of North America (1958) Smithsonian Miscellaneous Collections 136: 1-112 |
 | Evolution and classification of the pocket gophers of the subfamily Geomyinae Robert J Russell (1968) University of Kansas publications, Museum of Natural History 16(6): 473-579 |
 | A New Heteromyid Rodent From The Early Oligocene Of Natrona County Wyoming R J Emry (1972) Proceedings of The Biological Society of Washington 85: 179-190 |