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C. S. Grobbelaar, A. J. H. Goodwin, Report on the Skeletons and Implements in Association with Them from a Cave near Bredasdorp, Cape Province, The South African Archaeological Bulletin, Vol. 7, No. 27 (Sep., 1952), pp. 95-107
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Grobbelaar et al. (1952) studied this question.
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