"Ethiopia" . . "Combined Prehistoric Expedition to the Central Rift Valley of Ethiopa (1972)" . . . "Polska Akademia Nauk. Instytut Historii Kultury Materialnej." . . "Geología estratigráfica - Etiopía - Pleistoceno." . . "Paleolit Etiopia." . . "Great Rift Valley" . . "Arqueología prehistórica Etiopía." . . "Paleolítico - Etiopía." . . "Combined Prehistoric Expedition to the Central Rift Valley of Ethiopia, 1972." . . . "Prehistoria Etiopía." . . "Etiopia" . . . . . . . . . . . . "A Middle Stone Age sequence from the Central Rift Valley, Ethiopia"@en . . . . . . . . . . "A middle stone age sequence from the central rift valley, Ethiopia" . . . . . . . . . . . . . "A Middle Stone Age sequence from the central rift valley, Ethiopia" . . . . . . "A Middle stone age sequence from the central Rift valley, Ethiopia" . . "Wadi - Tierreste - Knochen." . . "A Middle Stone Age sequence from the central Rift Valley, Ethiopia" . . . . . "A middle stone age sequence from the central Rift Valley, Ethiopia" . "A middle stone age sequence from the central Rift Valley, Ethiopia"@en . . "A Niddle Stone Age sequence from the Central Rift Valley, Ethiopia" . . "A middle stone age sequence from the Central Rift Valley, Ethiopia" . "A middle stone age sequence from the Central Rift Valley, Ethiopia"@en . . . . . .