Collection contains a photocopy of typed transcription of a letter report that Francisco Antonio Barbastro wrote to the Viceroy Count de Revillagigedo, from the Aconchi Mission, and completed on Dec. 1, 1793. It was apparently sent first to his guardian superior at the Querétaro College, Father Juan Francisco Rivera, because Rivera added his addendum to the Viceroy, dated Jan. 21, 1794. Barbastro's 48-page report first discusses conditions in Sonora: the geography, the missions and towns, the temporal state, the spiritual state, and Indian industries. The most substantial section follows and concerns the secularization of the missions.