13 Tex. Admin. Code § 21.6
Official Texas historic markers are those markers and plaques awarded, approved, or administered by the Texas Historical Commission. They include centennial markers awarded by the state in 1930s, Civil War centennial markers (1960s), medallions, and markers awarded by the Texas Historical Commission or its predecessor, the Texas State Historical Survey Committee.
Source Note:The provisions of this §21.6 adopted to be effective July 9, 1996, 21 TexReg 5974.