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5. "Sobre as divergências e divisão de ?Viração?." N.p.:, 1981., Box: 2. Eduardo Sarno Collection of Leftist Movements in Brazil, 2002-03. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/371412 Accessed September 26, 2026.