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ลำดับที่LC คำอธิบาย
1 Environmental technology. Sanitary engineering
2 Hazardous substances and their disposal
3 Municipal engineering
4 Environmental protection
5 Environmental pollution
6 Environmental effects of industries and plants
7 Water supply for domestic and industrial purposes
8 Water pollution
9 Water purification. Water treatment and conditioning. Saline water conversion
10 Water distribution systems
11 Sewage collection and disposal systems. Sewerage
12 Municipal refuse. Solid wastes
13 Street cleaning. Litter and its removal
14 Special types of environment Including soil pollution, air pollution, noise pollution
15 Industrial and factory sanitation
16 Industrial and factory wastes
17 Rural and farm sanitary engineering
18 Low temperature sanitary engineering
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