Other
Archaeology.info: Australopithecus Robustus
This Archaeology.Info site contains information on the Australopithecus Robustus. This site also includes an extensive section on diagnostic features and references.
Other
Washington State University: Hominid Species Timeline
This complete resource contains a chronological chart that shows the main hominid species and their approximate relationships in time. A description of each hominid is included as well.