Before any such drainage district shall be organized, a petition shall be filed in the office of the secretary of state, signed by not less than two-fifths (2/5) of the landowners within said proposed district as shown by a verified list of said landowners taken by a landowner of said proposed district to be selected by the first ten (10) signers of the petition. A verified list of landowners shall be attached to and filed with the petition in the office of the secretary of state as an exhibit: Provided, That for purposes of determining ownership, the county clerk of the county in which any part of the proposed drainage district is described shall, upon demand, furnish the record of the ownership of the lands within the county from the tax rolls of said county, and said record of ownership shall be satisfactory evidence of title.