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McIver, J. and Ferguson, J. 1977. Kimberlitic, melilititic, trachytic and carbonatitic eruptives at Saltpetre Kop, Sutherland, South Africa. International Kimberlite Conference: Extended Abstracts. 2, 1 (Sep. 1977), 212–214. DOI:https://doi.org/10.29173/ikc995.