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Dyfyniad Arddull ChicagoRegional Conference for Africa, 6th, Durban, P. J. N. Pells, and A. Mac G. Robertson. Soil Mechanics and Foundation Engineering: Proceedings of the Sixth Regional Conference for Africa, Durban, 1975. Cape Town: A. A. Balkema, 1976.
Dyfyniad MLARegional Conference for Africa, 6th, Durban, et al. Soil Mechanics and Foundation Engineering: Proceedings of the Sixth Regional Conference for Africa, Durban, 1975. A. A. Balkema, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.