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In page Stone Age:

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By voluntary agreement,[citation needed] archaeologists respect the decisions of the Pan-African Congress on Prehistory, which meets every four years to resolve the archaeological business brought before it. Delegates are actually international; the organization takes its name from the topic.[4] Louis Leakey hosted the first one in Nairobi in 1947. It adopted Goodwin and Lowe's 3-stage system at that time, the stages to be called Early, Middle and Later.