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_a333.72 _220 |
| 100 | 1 | _aDuvenage, J. J. | |
| 245 | 1 | 0 |
_aNatuurbewaring : _b'n noodsaaklikheid / _cJ.J. Duvenage. |
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_aPotchefstroom : _bInstituut vir Bevordering van Calvinisme, P.U. vir C.H.O., _c[19--] |
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| 300 | _a8 p. | ||
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_aStudiestuk _vnr. 23 |
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| 650 | 0 | _aEnvironmental protection. | |
| 650 | 0 | _aConservation of natural resources. | |
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_aWetenskaplike bydraes van die PU vir CHO. _nReeks F, _pInstituut vir die Bevordering van Calvinisme. _nReeks F1, _pIBC-studiestukke _v0023 |
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