• Die gronde van die Karoo 

      Ellis, Freddie (Stellenbosch : Stellenbosch University, 1988)
      ENGLISH ABSTRACT: Soil information pertaining to one of the most extensive arid and semi-arid areas of South Africa is limited. This area, known as the Karoo, comprises 36 million hectares or 32% of the surface area of ...
    • Petroduric and "petrosepiolitic" horizons in soils of Namaqualand, South Africa 

      Francis, Michele Louise; Fey, Martin V.; Ellis, Freddie; Poch, Rosa Maria (Universia, 2012)
      Indurated, light-coloured 'sepiocrete' horizons have been found in Namaqualand Calcisols and Durisols. These horizons resembled calcrete but were non- to only mildly calcareous, resisted slaking in acid and alkali, and ...