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| 100 | _aSohnge, P.G. | ||
| 245 | _aGeology And Archaeology Of Vaal River Basin | ||
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_c1937 _bMinister Of Mines _aPretoria |
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| 300 | _a190p.36plts | ||
| 365 | _cRs. | ||
| 440 | _aGEOLOGICAL SURVEY MEMOIR NO. 35. | ||
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| 700 | _aSohnge, P.G. Lowe,C. Van Riet. | ||
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