| On a lower molar hominid tooth from the Chou Kou Tien deposit | Geological Survey of China | Davidson Black |
| On an adolescent skull of Sinanthropus pekinensis in comparison with an adult skull of the same species and with other hominid skulls, recent and fossil | Palaeontologica Sinica. Series D v. 7, fasc. 2. | Davidson Black |
| On Pithecanthropus erectus - a transitional form between man and the apes | J. Anthropol. Inst. G. B. Ireland 25 | Eugène Dubois |
| On the concepts and terminology of vertical subspecies and species. National research Council committee on common problems of genetics | | Ernst Mayr |
| Original of Paranthropus robustus Face - SK 48 | | Didier Descouens, Ditsong National Museum of Natural History , Jose Braga |
| Origin Stories - First Steps at Laetoli | | The Leakey Foundation |
| Ostatki musterskogo zhilischa na Dnestre | Sovetskaja etnografija 1 | A.P. Chernysh |
| Osteogenic tumour in Australopithecus sediba. Earliest hominin evidence for neoplastic disease | South African Journal of Science 112(7/8) | Edward Odes, Jackie Smilg, Lee Berger, Marc Meyer, Maryna Steyn, Patrick Randolph-Quinney, Paul Tafforeau, Scott Williams, Steven Churchill, Tanya Augustine |
| Palaeoanthropological Fieldwork in Hadar, Ethiopia (1974) | | The Hominin Story |
| Palaeoanthropology. Small-brained and big-mouthed | Nature 502(7472) | Fred Spoor |
