Wis. Stat. § 891.16

A certificate by the secretary of state, under the great or lesser seal, to any facts which appear from the books, files and records in the secretary of state’s office or the office of the commissioners of public lands in regard to the grant, conveyance or transfer of any land by the United States to the territory or state of Wisconsin, and also in regard to the sale, conveyance or transfer of any such land by said territory or state shall be received as presumptive evidence of the facts so certified.