“Northern Paraná under Surveilance: Searching and Digitalization of Photographs Produced by the Paraná State Investigation Office of Social and Political Order (DOPS PR) Related With the North Region”. Revista de História Regional 13, no. 1 (May 15, 2008). Accessed June 10, 2026. https://revistas.uepg.br/index.php/rhr/article/view/2259.