To Whom It May Concern:

I, David T. Szczupak, hereby appoint Sheri H. Edison and
Scott B. Ullem, 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 19th day of October 2012.


/s/ David T. Szczupak
David T. Szczupak




Signed or attested before me on the 19th day of October 2012 by
David T. Szczupak.


/s/ Loralie Lynn Jenkins
Notary Public

Loralie Lynn Jenkins, Notary Public
State of Michigan
My Commission Expires September 25, 2017