MARTÍNEZ-FORTÚN MEDRANO, E. Español Correspondence in the process of identifying the photographs of León Martínez-Fortún Erlés in the photographic collection of the Martínez-Fortún Fonds of the Municipal Archive of Valladolid. Revista General de Información y Documentación, v. 35, n. 1, p. 63–80, 15 Jul.2025.