BioStor
 | Lower vertebrates from the late Cretaceous Hell Creek Formation, McCone County, Montana R Estes, P Berberian and C A M Meszoely (1969) Breviora 337: 1-33 |
 | The fossil record of amphiumid salamanders R Estes (1969) Breviora 322: 1-11 |
 | Paleoecology of a late Cretaceous vertebrate community from Montana R Estes and P Berberian (1970) Breviora 343: 1-35 |