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MDU        0000067716    
Filing Date Form Type Description Document
2011-02-02 SC 13G/A View Document
2011-01-13 NO ACT AUTO-GENERATED PAPER DOCUMENT View Document
2011-01-12 8-K 8K View Document
2011-01-03 4 PRIMARY DOCUMENT View Document
2010-12-08 4 PRIMARY DOCUMENT View Document
2010-12-08 4 PRIMARY DOCUMENT View Document
2010-12-08 4 PRIMARY DOCUMENT View Document
2010-12-08 4 PRIMARY DOCUMENT View Document
2010-12-01 4 PRIMARY DOCUMENT View Document
2010-12-01 4 PRIMARY DOCUMENT View Document
2010-11-16 8-K 8-K View Document
2010-11-16 4 PRIMARY DOCUMENT View Document
2010-11-08 4 PRIMARY DOCUMENT View Document
2010-11-03 10-Q MDU RESOURCES GROUP, INC. 3RD QUARTER 2010 FORM 10-Q View Document
2010-10-28 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2010-10-21 8-K MDU RESOURCES GROUP, INC. FORM 8K View Document
2010-09-30 4 PRIMARY DOCUMENT View Document
2010-08-17 8-K 8-K View Document
2010-08-06 10-Q MDU RESOURCES GROUP, INC. 2ND QUARTER 2010 FORM 10-Q View Document
2010-08-03 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2010-06-30 4 PRIMARY DOCUMENT View Document
2010-06-18 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2010-06-17 11-K MDU RESOURCES GROUP, INC. 2009 FORM 11-K View Document
2010-05-26 4 PRIMARY DOCUMENT View Document
2010-05-24 4 PRIMARY DOCUMENT View Document
2010-05-24 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-18 4 PRIMARY DOCUMENT View Document
2010-05-10 4 PRIMARY DOCUMENT View Document
2010-05-07 4 PRIMARY DOCUMENT View Document
2010-05-05 10-Q MDU RESOURCES GROUP, INC. 1ST QUARTER 2010 FORM 10-Q View Document
2010-04-30 S-8 POS S-8 POS View Document
2010-04-30 AW AW View Document
2010-04-30 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2010-04-30 8-A12B/A 8-A12B/A View Document
2010-04-30 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2010-04-19 POS AM View Document
2010-04-08 DEFA14A DEFA14A View Document
2010-04-08 8-K 8-K View Document
2010-04-02 4 PRIMARY DOCUMENT View Document
2010-03-15 ARS AUTO-GENERATED PAPER DOCUMENT View Document
2010-03-12 DEF 14A DEFINITIVE PROXY STATEMENT View Document
2010-03-11 8-K 8-K View Document
2010-03-01 4 PRIMARY DOCUMENT View Document
2010-03-01 4 PRIMARY DOCUMENT View Document
2010-02-23 3 PRIMARY DOCUMENT View Document
2010-02-18 8-K FORM 8-K View Document
2010-02-17 4 PRIMARY DOCUMENT View Document
2010-02-17 4 PRIMARY DOCUMENT View Document
2010-02-17 4 PRIMARY DOCUMENT View Document
2010-02-17 4 PRIMARY DOCUMENT View Document
2010-02-17 10-K MDU RESOURCES GROUP, INC. FORM 10-K FOR PERIOD ENDED 12/31/2009 View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-16 4 PRIMARY DOCUMENT View Document
2010-02-12 SC 13G/A 13G/A FILING AS OF 12/31/09 View Document
2010-02-03 5 PRIMARY DOCUMENT View Document
2010-02-01 PRE 14A View Document
2010-02-01 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2010-01-29 SC 13G View Document
2010-01-19 NO ACT AUTO-GENERATED PAPER DOCUMENT View Document
2010-01-19 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2010-01-07 8-K FORM 8-K View Document
2009-12-31 4 PRIMARY DOCUMENT View Document
2009-12-10 4 PRIMARY DOCUMENT View Document
2009-12-10 4 PRIMARY DOCUMENT View Document
2009-12-10 4 PRIMARY DOCUMENT View Document
2009-11-18 4 PRIMARY DOCUMENT View Document
2009-11-17 8-K FORM 8-K View Document
2009-11-16 4 PRIMARY DOCUMENT View Document
2009-11-16 4 PRIMARY DOCUMENT View Document
2009-11-05 10-Q MDU RESOURCES GROUP, INC. 3RD QUARTER 2009 FORM 10-Q View Document
2009-10-30 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2009-10-01 4 PRIMARY DOCUMENT View Document
2009-09-01 4 PRIMARY DOCUMENT View Document
2009-08-17 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2009-08-11 4 PRIMARY DOCUMENT View Document
2009-08-07 10-Q MDU RESOURCES GROUP, INC. 2ND QUARTER 2009 FORM 10-Q View Document
2009-08-03 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2009-06-30 4 PRIMARY DOCUMENT View Document
2009-06-19 424B3 PROSPECTUS SUPPLEMENT FOR REGISTRATION NO. 333-151215 - MDU RESOURCES GROUP, INC View Document
2009-06-16 11-K FORM 11-K FOR YEAR ENDED 12/31/2008 - MDU RESOURCES GROUP, INC. View Document
2009-05-27 4 PRIMARY DOCUMENT View Document
2009-05-22 4 PRIMARY DOCUMENT View Document

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