| Filed On | Filing |
|---|---|
| 08 Jan 2010 | SC 13G |
| 05 Feb 2009 | SC 13G |
| 05 Feb 2008 | SC 13G |
| 05 Feb 2008 | SC 13G |
| 05 Feb 2008 | SC 13G |
| 23 Jan 2007 | SC 13G |
| 26 Jan 2006 | SC 13G |
| 14 Feb 2005 | SC 13G |
| 13 Feb 2001 | SCHEDULE 13G - 02-14-01 - BLACK HILLS CORPORATION |
| 11 May 2000 | SCHEDULE 13G |
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