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2. Code of Practice for Safety Precautions to Be Taken when Entering a Sewerage System,1987
3. Occupational Health and Safety Management Systems - Requirements with Guidance for Use [CHD 8: Occupational Safety, Health and Chemical Hazards],2007
4. Code of Practice for Installation of Septic Tanks, Part I: Design Criteria and Construction,1985
5. Code of Practice for Installation of Septic Tanks, Part II: Secondary Treatment and Disposal of Septic Tank Effluent [CED 24: Public Health Engineering.],1985