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- Drinking water -- Contamination -- South Africa -- Eerste River 1
- Drinking water -- Health aspects 1
- Drinking water -- Microbiology -- Botswana -- Gaborone 1
- Drinking water -- Purification 5
- Drinking water -- South Africa 1
- Drinking water -- South Africa -- Cape Town 1
- Drinking water protection 1
- Drone aircraft 2
- Drone aircraft -- Control systems 1
- Drone aircraft -- Design and construction 3
- Drone aircraft in remote sensing 1
- Dropouts -- Prevention 1
- Dropouts -- South Africa 1
- Drops 2
- Drosanthemum hallii 1
- Drosanthemum micans 1
- Drought management 1
- Droughts 1
- Droughts -- Economic aspects -- South Africa -- Western Cape 1
- Droughts -- South Africa -- Western Cape -- Management 1