Tex. Natural Resources Code § 62.135: AUTHORIZED INVESTMENTS.

The bonds issued under the provisions of this subchapter are legal and authorized investments for banks, saving banks, trust companies, building and loan associations, insurance companies, fiduciaries, trustees, guardians, and for the sinking funds of cities, towns, villages, counties, school districts, or other political corporations or subdivisions of the state.

Acts 1977, 65th Leg., p. 2498, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.