1. Clean Water Act of 1977 Public Law 95-217 1977
2. Safe Drinking Water Act Public Law 93-523 1974
3. T. C. Drinking Water Standards for Organic Chemicals;Jorling;Water & Sewage Works,1978
4. Erb , J. E. Fabian , T. R. Water Conservation-Wastewater Flow Reduction in Pennsylvania Conf. Water Pollution Control Assn. of Pennsylvania, Hershey, Pa 1977