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2. Historic Review of the Development of Sanitary Engineering in the United States During the Past 150 Years-Water Works;Fuller;Trans. ASCE,1928
3. Waterborne Outbreaks in the United States and Canada, and Their Significance;Gorman;Jour. AWWA,1939
4. Greeley , S. A. Testing Stations for Sanitary Engineering-An Outstanding Achievement Trans. ASCE 1953