0000950120-97-000264 424B3 1 19970926 NYSE PSE MDU RESOURCES GROUP INC 0000067716 4932 410423660 DE 1231 424B3 33 033-46605 97686505 400 N FOURTH ST BISMARCK ND 58501 7012227900 400 NORTH FOURTH ST BISMARCK ND 58501 MONTANA DAKOTA UTILITIES CO 19850429 424B3 1 000095012097000264-001-seq1-424b3.txt PRICING SUPPLEMENT NO. 7 TO REGISTRATION STATEMENT