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- Environmental engineering 24
- CE 22
- Air pollution engineering 8
- CE,Sewage disposal engineering,Air pollution engineering, Environmental engineering 7
- Sewage disposal - Air pollution engineering 7
- Sewage disposal engineering 7
- Sewage disposal engineering - Air pollution engineering 7
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- Basic environmental engineering 2
- Elementary biology 2
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- Environmental science 1
- Environmental studies 1
- Green technologies 1
- Wastewater engineering 1
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