The over-all approach and gal of the Chicago sanitary district in the use of radiation.
D002641:Chicago; D003365:Costs and Cost Analysis; D008722:Methods; D011830:Radiation Effects; D011874:Radiometry; D012498:Sanitary Engineering; D012722:Sewage / Q000528:radiation effects*; D013242:Sterilization
D012722:Sewage