1. Surveying Arsenic Occurrence.;Frey;Jour. AWWA,1997
2. Occurrence of Radon, Radium, and Uranium in Groundwater.;Longtin;Jour. AWWA,1996
3. Nationwide and California Arsenic Occurrence Studies.;Davis,1994
4. Cheng , S.D. Bellamy , W.D. Ruiz , H. Removal of Arsenic by Enhanced Coagulation and Membrane Technology. Proc. 1994 AWWA Ann. Conf., New York.