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3. The volcanic belt of the Lebombo; a region of tension;Du Toit;Trans. R. Soc. S. Afr.,1930
4. The geology of the Stormberg volcanics Swaziland;Urie;Swaziland Geol. Surv. Mines Dep.,1963
5. The structural and magmatic evolution of the Lebombo monocline, southern Africa, with particular reference to Swaziland;Cleverly,1977