$MDU 424B3 SEC Filings

Filed On	Filing
19 Jun 2009	PROSPECTUS SUPPLEMENT FOR REGISTRATION NO. 333-151215 - MDU RESOURCES GROUP, INC
14 Apr 2004	SUPPLEMENT TO PROSPECTUS
08 Jan 2001	PROSPECTUS SUPPLEMENT
25 May 2000	PROSPECTUS FOR MDU RESOURCES GROUP
30 Nov 1998	PROSPECTUS SUPPLEMENT
16 Sep 1998	PRICING SUPPLEMENT NO. 9
13 Jul 1998	PROSPECTUS SUPPLEMENT
26 Sep 1997	PRICING SUPPLEMENT NO. 8 TO REGISTRATION STATEMENT
26 Sep 1997	PRICING SUPPLEMENT NO. 7 TO REGISTRATION STATEMENT