Brian Maguire, Foreign Pebble Pounding Artefacts in the Breccias and the Overlying Vegetation Soil at Makapansgat Limeworks, The South African Archaeological Bulletin, Vol. 20, No. 79, Makapansgat Limeworks (Sep., 1965), pp. 117-130
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Brian Maguire (1965) studied this question.
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