Martínez-Fortún Medrano, E. 2025. 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. 35, 1 (Jul. 2025), 63–80. DOI:https://doi.org/10.5209/rgid.98938.