Neb. Rev. Stat. § 76-206: Neb. Rev. Stat. § 76-206

Unless such intention is expressly negatived by the language in the instrument, a covenant in a conveyance of real property that the grantor is seized, or lawfully seized, or words to like effect, shall be interpreted as a covenant that the grantor has good title to the very estate in quantity and quality which he purports to convey.