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4. Blackwell, B., Schwarcz, H.P. and Thackeray, J.F. (in preparation b). Electron spin resonance dating of tooth enamel from the Australopithecine site, Swartkrans, South Africa.
5. Blackwell, B., Schwarcz, H.P. and Tobias, P.V. (in preparation b). Electron spin resonance dating of tooth enamel from the Australopithecine site, Sterkfontein, South Africa.