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Browsing by Supervisor "Fortsch, E.B."
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(University of Pretoria, 1987)
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(University of Pretoria, 1971)This study comprises a petrographical and mineralogical investigation of rocks from an area 850 sq. km in size, situated about 80km northeast of Middelburg. Roughly half of the area is occupied by rocks of the epicrustal ...
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(University of Pretoria, 1980)The occurrence and distribution of mineral matter in 35 coal products samples was determined by means of radio-frequency ashing and X-ray diffraction. The association of illite with high rank coals in contrast with that ...
Now showing items 1-3 of 3