Ninety-seven volumes of this material consist of typewritten transcriptions made by Blake (1877-1955) of official records and personal papers found in the Office of the County Clerk in Nacogdoches, in the Nacogdoches Archives located in the Texas State Archives, in the General Land Office of Texas, and in The University of Texas Archives, much of the material having been translated from the Spanish by Blake and others. The purpose of the enterprise, to which Blake devoted a major part of his life, was to prepare a definitive documentary history of that portion of Spanish and Mexican Texas bordered by the present city of San Antonio on the west and by Nacogdoches on the east. Types of material transcribed include letters, literary productions, legal papers, financial papers, census records, subpoenas, jury verdicts, receipts, petitions, account papers, warrants, promissory notes, affidavits, powers of attorney, summonses, election returns, bills of slave sales, commissions, general bills of sale, resolutions, orders, civil-suit proceedings, criminal proceedings, marriage contracts, lists of jurors, grand-jury venires, proclamations, bonds, minutes, writs, certificates, field notes, broadsides, maps, and muster rolls. A calendar has been prepared for these volumes.

Other materials include personal papers of Blake (correspondence, speeches, literary productions, financial records, notes, certificates, memorabilia, and miscellaneous), various documents used by Blake as historical sources for his productions (land records, transcripts of archival materials, biographical files, letters, historical accounts, diaries, military and civil government documents, newspaper clippings, and others, many of them photostatic copies of transcripts), and papers related to his career as a county clerk and court reporter (1914-1955) in Nacogdoches (1925-1942) and Austin (1943-1955), which include typed transcripts of court cases and instructions to juries.