Nebraska Revised Statute 14-3,114
All petitions for improvements provided for in sections 14-384 to 14-3,127 shall be upon printed blanks and shall describe the street to be improved and improvement desired. The city shall from time to time prescribe the form of such blanks. Signatures to such petitions shall have no conditions attached and all signatures shall be acknowledged before a notary public.
Laws 1959, c. 36, § 31, p. 207.