Exhibit 31.2
                                 CERTIFICATION

      I, Scott P. Doescher, certify that:

      1.    I have reviewed this Annual Report on Form 10-K of Wausau-Mosinee
Paper Corporation (the "registrant");

      2.    Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this report;

      3.    Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this report;

      4.    The registrant's other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial
reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for the
registrant and we have:

            (a)   designed such disclosure controls and procedures, or caused
      such disclosure controls and procedures to be designed under our
      supervision, to ensure that material information relating to the
      registrant, including its consolidated subsidiaries, is made known to us
      by others within those entities, particularly during the period in which
      this report is being prepared;

            (b)   designed such internal control over financial reporting, or
      caused such internal control over financial reporting to be designed
      under our supervision, to provide reasonable assurance regarding the
      reliability of financial reporting and the preparation of financial
      statements for external purposes in accordance with generally accepted
      accounting principles;

            (c)   evaluated the effectiveness of the registrant's disclosure
      controls and procedures and presented in this report our conclusions
      about the effectiveness of the disclosure controls and procedures, as of
      the end of the period covered by this report based on such evaluation;
      and

            (d)   disclosed in this report any change in the registrant's
      internal control over financial reporting that occurred during the
      registrant's fourth fiscal quarter that has materially affected, or is
      reasonably likely to materially affect, the registrant's internal control
      over financial reporting; and

      5.    The registrant's other certifying officer and I have disclosed,
based on our most recent evaluation of internal control over financial
reporting, to the registrant's auditors and the audit committee of the
registrant's board of directors (or persons performing the equivalent
functions):

            (a)   all significant deficiencies and material weaknesses in the
      design or operation of internal control over financial reporting which
      are reasonably likely to adversely affect the registrant's ability to
      record, process, summarize and report financial information; and

            (b)   any fraud, whether or not material, that involves management
      or other employees who have a significant role in the registrant's
      internal control over financial reporting.

Date:  March 15, 2005                      SCOTT P. DOESCHER
                                           Scott P. Doescher
                                           Senior Vice President, Finance
                                           (Principal Financial Officer)