| Filed On | Filing |
|---|---|
| 12 Apr 2023 | DEF 14A |
| 14 Apr 2022 | DEF 14A |
| 14 Apr 2021 | DEF 14A |
| 07 Apr 2020 | DEF 14A |
| 19 Apr 2018 | DEF 14A |
| 19 Apr 2017 | DEF 14A |
| 20 Apr 2016 | DEF 14A |
| 20 Apr 2015 | DEF 14A |
| 22 Apr 2014 | DEF 14A |
| 24 Apr 2013 | DEF 14A |
| 26 Apr 2012 | DEFINITIVE PROXY STATEMENT |
| 21 Apr 2011 | DEF 14A |
| 30 Apr 2010 | DEF 14A |
| 30 Apr 2009 | FORM DEF 14A |
| 23 May 2008 | PETROLEUM DEVELOPMENT CORP DEF 14A 6-23-2008 |
| 30 Jul 2007 | DEF 14A |
| 08 Aug 2006 | DEF 14A |
| 02 May 2005 | DEF 14A |
| 30 Apr 2004 | DEF 14A |
| 30 Apr 2003 | DEF PROXY 2003 |
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