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Analyses of coal product samples of producing South African collieries
Boshoff, H. P., (1993)
An enquiry in regard to coal shortages in South Africa during 1951 : a review article
Davies, Brinsley H., (1952)
Study of the embargo of coal exports from South Africa : report of a study conducted under the auspices of the Group of Independent Experts appointed by the Governing Board of the ILO to follow up and monitor the implementation of sanctions and other action against apartheid
(1992)