16 Tex. Admin. Code § 1.104
A copy or excerpt of a document may be admitted as evidence if the original is not readily available and if authenticity is established by competent evidence. When numerous documents are offered, the examiner may limit those admitted to a number of documents which are typical and representative. The examiner may require the abstracting or summarizing of relevant data from documents and the presentation of abstracts or summaries in exhibit form. All parties shall have the right to examine the documents abstracted or summarized.
Source Note:The provisions of this §1.104 adopted to be effective June 1, 1991, 16 TexReg 2289.