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http://crai.ub.edu/ca/coneix-el-crai/biblioteques/CRAI-Biblioteca-de-Filosofia-Geografia-Historia/exposicio-virtual-300-anys-de-Leibniz-
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http://cataleg.ub.edu/record=b1918085~S1*cathttp://cataleg.ub.edu/record=b1779894~S1*cat-
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