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'n Ondersoek van die puinafsettings in die noordelike knakpunt van die Daspoortrand naby Pretoria. (Investigation of deposits in the northern knickpoint of the Daspoort ridge near Pretoria)
(supprimer)
laboratory analysis were made of the exposed gravel deposits at the Daspoort ridge tunnel. From this investigation the tentative conclusion was made that there appeared to be two main periods of debris and one of sand deposition in the knickpoint