Pius IX. Breve de Pio IX concediendo indulgencia plenaria a los visitantes de la Catedral de Sonora., June 23, 1868.

Pius IX. Breve de Pio IX concediendo indulgencia plenaria a los visitantes de la Catedral de Sonora., June 23, 1868., Guide_No.: 1749. Guide to the Latin American Manuscripts in the University of Texas Library, Z 1601 T486. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/501774 Accessed September 27, 2026.