To Whom It May Concern:

I, David S. Haffner, hereby appoint James J. Seifert, Gene C.
Wulf and Stanley A. Jaffy, each and individually, my true and
lawful attorney-in-fact, for and in my name, place and stead,
with full power of substitution, to sign on my behalf any and
all Forms 3, 4 and 5 for the submission of such forms to the
Securities and Exchange Commission, and to take any and all
actions necessary or advisable to file such Forms with the
Securities and Exchange Commission.

IN WITNESS WHEREOF, the undersigned has caused these presents to
be executed on the 28th day of April 2004.


/s/ David S. Haffner
David S. Haffner




Signed or attested before me on the 28th day of April 2004 by
David S. Haffner.


/s/ Candace Carver
Notary Public

Candace Carver, Notary Public
State of Missouri, Jasper County
My Commission Expires Aug 5, 2006