1. Notes on some petrified wood from Banke, Namaqualand;Adamson;Trans. R. Soc. S. Afr.,1931
2. Development of Orapa and Lethakane diamond mines, Botswana;Allen;Trans. Inst. Min. Metal. Sect. A, Mining Ind.,1981
3. The angiosperm palaeoflora from the Orapa pipe, Botswana;Bamford,1990
4. Origin of Sedimentary Rocks;Blatt,1980
5. The alluvial-fan environment;Bull;Progr. Phys. Geogr.,1977