13 Tex. Admin. Code § 21.13
Primary source data (writing, publications, or other evidence from the time of the event) take precedence over all documentation in the evaluation of any historical topic. Legal documents take precedence over private papers. Testimony from disinterested and authoritative sources takes precedence over testimony of interested individuals.
Source Note:The provisions of this §21.13 adopted to be effective July 9, 1996, 21 TexReg 5974.