| Giver | Post | Date |
| Iwen | Re: The cost C, in dollars, to remove p percent of a certain pollutant fro | 16-Jan-2024 |
| VictorDantas | Re: The cost C, in dollars, to remove p percent of a certain pollutant fro | 24-Aug-2023 |
| Tshoo | Re: The cost C, in dollars, to remove p percent of a certain pollutant fro | 15-Nov-2020 |
| ayywon | Re: The cost C, in dollars, to remove p percent of a certain pollutant fro | 10-Sep-2020 |
| Kadiatou | Re: The cost C, in dollars, to remove p percent of a certain pollutant fro | 04-Aug-2018 |