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Bodas de oro químicas
(Pontificia Universidad Católica del Perú, 2017-02-26)
Chemical golden anniversary: as tribute to the PUCP's chemical section for its 50 years of work this essay features stamps with gold-related pictures
¿Qué hay en un nombre (químico)?
(Pontificia Universidad Católica del Perú, 2010-09-19)
A short note on the history of Chemistry through stamps from all over the world