Glynn Isaac and Richard Leakey's 'Sonjo Expedition' in 1963-64 (to examine Pleistocene fossiliferous strata) discovered Sonjo living and cultivating at Peninyi.
Glynn Isaac and Richard Leakey's 'Sonjo Expedition' in 1963-64 (to investigate Pleistocene fossil-bearing rock layers) discovered Sonjo living and cultivating at Peninyi.