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2. Muller John The Potential for Energy Savings Through Reductions in Hot Water Consumption. The Penn. State Univ. Inform. Rep. No. 74. University Park, Pa. 1975
3. Cole , C.A. Impact of Home Water Saving Devices on Collection Systems and Waste Treatment. The Penn. State Univ. Inform. Rep. No. 74. University Park, Pa. 1975