José Domingo. de Letona at San Ildefonso de Mejico writes Sor. Lic. Dn. José Migl. Sanchez Navarro: Dn. Lucas has not been able to secure the instruments from Guadalajara; he gives a detailed account of his studies and asks for aid, 1785, Jan. 11:

José Domingo. de Letona at San Ildefonso de Mejico writes Sor. Lic. Dn. José Migl. Sanchez Navarro: Dn. Lucas has not been able to secure the instruments from Guadalajara; he gives a detailed account of his studies and asks for aid, 1785, Jan. 11:, Box: 1, Item: 1966. Sánchez Navarro Collection of Documents for a History of Texas and Coahuila, 30605850. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/300564 Accessed September 26, 2026.