
<PAGE>

                                                                     EXHIBIT 23





                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation of
our report incorporated by reference in this Form 10-K, into the Company's
previously filed Registration Statements File Nos. 33-60157, 333-05463,
333-21007 and 33-57053.


                                       /s/ Arthur Andersen LLP
                                       ARTHUR ANDERSEN LLP


Minneapolis, Minnesota,
  March 25, 1998

