Geolgical Survey 1912- Middelburg-Belfast - Hall
- ZA HPRA A1138-AA-927
- File
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Geolgical Survey 1912- Middelburg-Belfast - Hall
Geological Structure - Middelburg District - Mellor
Geological Survey - 1906 - Middelburg Tvl. - Mellor
Netherlands Bank of South Africa
African Life Assurance Society Ltd.