13 Tex. Admin. Code § 1.41
A major resource system or regional library system shall serve a population of 200, 000 or more within 4,000 or more square miles, including contiguous whole counties.
Source Note:The provisions of this §1.41 adopted to be effective September 1, 1977, 2 TexReg 1923; amended to be effective April 30, 1985, 10 TexReg 1227.