1
 
                                                                      EXHIBIT 23
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
of our reports dated January 27, 1998 included in this Form 10-K into the
Company's previously filed registration statements on Form S-8 (File No.'s
333-22035 and 333-17473), Form S-4 (File No.'s 33-60013 and 33-302671) and Form
S-3 (File No. 33-5780).
 
ARTHUR ANDERSEN LLP
Chicago, Illinois
March 31, 1998