Wis. Stat. § 891.04: Certificate as to public lands.

The certificate of the executive secretary appointed under s. 24.55 under the official seal, that any specified piece or tract of land belongs to or is mortgaged to the state, or that the state has any interest, legal or equitable, in that land shall be presumptive evidence of the facts so stated. The certificate of the secretary of natural resources under the official seal of the department that authority has been given to any person, naming the person, to seize timber or other materials specified in ch. 26 shall be presumptive evidence of the fact so stated.