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MDU        0000067716    
Filing Date Form Type Description Document
2012-12-10 4 PRIMARY DOCUMENT View Document
2012-12-10 4 PRIMARY DOCUMENT View Document
2012-11-30 4 PRIMARY DOCUMENT View Document
2012-11-20 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-11-20 8-K/A MDU RESOURCES GROUP, INC. FORM 8-K/A View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-20 4 PRIMARY DOCUMENT View Document
2012-11-07 10-Q MDU RESOURCES GROUP, INC. 3RD QUARTER 2012 FORM 10-Q View Document
2012-11-01 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-10-15 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-09-28 4 PRIMARY DOCUMENT View Document
2012-08-31 4 PRIMARY DOCUMENT View Document
2012-08-21 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-08-07 10-Q MDU RESOURCES GROUP, INC. 2ND QUARTER 2012 FORM 10-Q View Document
2012-08-02 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-06-29 4 PRIMARY DOCUMENT View Document
2012-06-14 11-K MDU RESOURCES GROUP, INC. FORM 11-K View Document
2012-05-30 4 PRIMARY DOCUMENT View Document
2012-05-29 4 PRIMARY DOCUMENT View Document
2012-05-25 4 PRIMARY DOCUMENT View Document
2012-05-25 4 PRIMARY DOCUMENT View Document
2012-05-24 4 PRIMARY DOCUMENT View Document
2012-05-04 10-Q MDU RESOURCES GROUP, INC. 1ST QUARTER FORM 10-Q View Document
2012-05-01 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-04-27 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-04-18 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-04-12 4 PRIMARY DOCUMENT View Document
2012-03-09 ARS AUTO-GENERATED PAPER DOCUMENT View Document
2012-03-09 DEF 14A DEFINITIVE PROXY STATEMENT View Document
2012-03-06 8-K 8-K View Document
2012-03-01 4 PRIMARY DOCUMENT View Document
2012-02-27 4 PRIMARY DOCUMENT View Document
2012-02-24 4 PRIMARY DOCUMENT View Document
2012-02-24 10-K MDU RESOURCES GROUP, INC. 2011 FORM 10-K View Document
2012-02-21 4 PRIMARY DOCUMENT View Document
2012-02-14 SC 13G/A 13G/A - AS OF 12/31/11 View Document
2012-02-14 SC 13G MDU AS OF 12/31/2011 View Document
2012-02-13 SC 13G/A View Document
2012-02-03 5 PRIMARY DOCUMENT View Document
2012-02-02 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2012-01-03 4 PRIMARY DOCUMENT View Document
2011-12-21 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-12-16 S-8 POS S-8 POS View Document
2011-12-16 S-8 POS S-8 POS View Document
2011-12-12 4 PRIMARY DOCUMENT View Document
2011-12-12 4 PRIMARY DOCUMENT View Document
2011-12-12 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-22 4 PRIMARY DOCUMENT View Document
2011-11-21 8-K 8-K View Document
2011-11-18 S-3ASR S-3ASR View Document
2011-11-15 4 PRIMARY DOCUMENT View Document
2011-11-14 4 PRIMARY DOCUMENT View Document
2011-11-04 10-Q MDU RESOURCES GROUP, INC. 3RD QUARTER 2011 FORM 10-Q View Document
2011-11-01 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-10-17 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-10-03 UPLOAD View Document
2011-09-30 4 PRIMARY DOCUMENT View Document
2011-09-29 CORRESP View Document
2011-09-02 CORRESP View Document
2011-08-31 UPLOAD View Document
2011-08-05 10-Q MDU RESOURCES GROUP, INC. 2ND QUARTER 2011 FORM 10-Q View Document
2011-08-02 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-06-30 4 PRIMARY DOCUMENT View Document
2011-06-27 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-06-14 11-K MDU RESOURCES GROUP, INC. FORM 11-K View Document
2011-05-27 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-05-25 4 FORM 4 View Document
2011-05-19 S-3ASR MDU RESOURCES GROUP, INC. FORM S-3ASR View Document
2011-05-13 8-K/A MDU RESOURCES GROUP, INC. FORM 8-K/A View Document
2011-05-05 10-Q MDU RESOURCES GROUP, INC. 1ST QUARTER 2011 FORM 10-Q View Document
2011-05-04 3 PRIMARY DOCUMENT View Document
2011-05-03 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-04-29 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-04-27 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document
2011-04-04 4 PRIMARY DOCUMENT View Document
2011-03-11 ARS AUTO-GENERATED PAPER DOCUMENT View Document
2011-03-11 DEF 14A DEFINITIVE PROXY STATEMENT View Document
2011-02-24 4 PRIMARY DOCUMENT View Document
2011-02-23 10-K MDU RESOURCES GROUP, INC. FORM 10-K FOR PERIOD ENDED 12/31/2010 View Document
2011-02-22 8-K 8-K View Document
2011-02-11 SC 13G/A 13G/A FILING AS OF 12/31/10 View Document
2011-02-11 4 PRIMARY DOCUMENT View Document
2011-02-03 8-K MDU RESOURCES GROUP, INC. FORM 8-K View Document

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