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| web | Laura Allen And Cleo Woelfle-E... | Mother Earth News | 2023-06-05 |
| web | | Greywater Action | 2018-02-02 |
| web | Laura Allen, Raphael Garcia, J... | San Francisco Public Utilities... | 2017-11-01 |
| web | Jeff Guo | Washington Post | 2015-03-24 |
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| web | Hari Srinivas | | 2013-03-21 |
| web | | Innovative Water Solutions | 2013-03-21 |
| web | Doug Pushard | HarvestH2O.com | 2013-03-21 |
| web | | Organization of American State... | 2013-03-01 |
| web | | Water Environment Research Fou... | |
| web | R.K. Misra, J.H. Patel and V.R... | Australian Centre for Sustaina... | |