Marquès i Sureda S. El Mestre Ramon Torroja i Valls : carta des de la presó = Teacher Ramon Torroja i Valls : a letter from jail. Educ. hist. [Internet]. 2009 Jun. 25 [cited 2026 Feb. 16];(13):157-70. Available from: https://revistes.iec.cat/index.php/EduH/article/view/51053.001