John Parkington, Charles Cable, P. L. Carter, H. J. Deacon, Janette Deacon, A. J. B. Humphreys, R. R. Inskeep, Glynn Isaac, L. Jacobson, Mary Leslie Brooker, Aron Mazel, P. T. Robertshaw, C. Garth Sampson, Anne I. Thackeray, Thomas P. Volman, Time and Place: Some Observations on Spatial and Temporal Patterning in the Later Stone Age Sequence in Southern Africa [with Comments and Reply], The South African Archaeological Bulletin, Vol. 35, No. 132 (Dec., 1980), pp. 73-112
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Parkington et al. (1980) studied this question.
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