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Fon alra Frêsena Frîdôme: in Ynlieding yn it Aldfryskby Piter SipmaMagoun et al. · Medieval Academy of America1948PDF158 KB
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A Microgênese da Explicação de um Problema Ambiental: Os casos Paulo e PiterEichler · Psicologia Reflexão e Crítica2001PDF509 KB
