Page:Library of Congress Classification Outline.djvu/281

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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