| Filed On | Filing |
|---|---|
| 20 May 2022 | FORM DEF 14A |
| 18 Nov 2021 | FORM DEF 14A |
| 11 Mar 2020 | FORM DEF 14A |
| 08 Mar 2019 | FORM DEF 14A |
| 19 Mar 2018 | DEF 14A |
| 26 Aug 2016 | DEF 14A |
| 24 Dec 2014 | DEF 14A |
| 20 May 2014 | DEF 14A |
| 28 Mar 2013 | CLEAN COAL DEFINITIVE PROXY 2013 |
| 04 May 2012 | CLEAN COAL DEFINITIVE PROXY STATEMENT 2012 |
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