Nebraska Revised Statute 72-259.06
72-259.06. School lands; adjacent to city of the first or second class; dedication of streets and alleys.
The filing of such plat and proceedings in the office of the register of deeds shall constitute a dedication of the streets and alleys contained therein so long as the same shall be used for such public purposes.
Laws 1953, c. 259, § 6, p. 869.