Sources
| Olorgesailie, a unique pre-historic site where hand axe tools were discovered | KBC Business | |
| Olorgesailie axes | Ryan Somma | |
| Olorgesailie fossils | Ryan Somma | |
| Olorgesailiefouilles(1) | Rossignol Benoît | |
| OlorgesailieLandscape1993 | Rossignol Benoît | |
| Olorgesailiesite1993(1) | Rossignol Benoît | |
| Olorgesailiesite1993(2) | Rossignol Benoît | |
| Olorgesailiesite1993(3) | Rossignol Benoît | |
| Olorgesailiesite1993(4) | Rossignol Benoît | |
| Omóplato grabado de la cueva de Altamira | Museo de Altamira | |