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Subclass TD
| TD1-1066 | Environmental technology. Sanitary engineering | ||
| TD159-168 | Municipal engineering | ||
| TD169-171.8 | Environmental protection | ||
| TD172-193.5 | Environmental pollution | ||
| TD194-195 | Environmental effects of industries and plants | ||
| TD201-500 | Water supply for domestic and industrial purposes | ||
| TD419-428 | Water pollution | ||
| TD429.5-480.7 | Water purification. Water treatment and conditioning. Saline water conversion | ||
| TD481-493 | Water distribution systems | ||
| TD511-780 | Sewage collection and disposal systems. Sewerage | ||
| TD783-812.5 | Municipal refuse. Solid wastes | ||
| TD813-870 | Street cleaning. Litter and its removal | ||
| TD878-894 | Special types of environment Including soil pollution, air pollution, noise pollution | ||
| TD895-899 | Industrial and factory sanitation | ||
| TD896-899 | Industrial and factory wastes | ||
| TD920-934 | Rural and farm sanitary engineering | ||
| TD940-949 | Low temperature sanitary engineering | ||
| TD1020-1066 | Hazardous substances and their disposal | ||
