The ownership of land of any of the petitioners may be shown by the county general tax roll of the county in which such land is situated, last equalized prior to the time of the filing of said petition with the county board. Any item on said assessment roll may be proved by a certificate of the county officer having the custody of said tax roll at the time of making said certificate.
[ 1927 c 254 § 11; RRS § 7402-11. Formerly RCW 89.20.530.]