Back تصنيف:العلم في 1840 Arabic Катэгорыя:1840 год у навуцы Byelorussian Categoría:Ciencia de 1840 Spanish Kategoria:1840 zientzian Basque رده:علم در ۱۸۴۰ (میلادی) Persian קטגוריה:1840 במדע HE 분류:1840년 과학 Korean Kategori:Vitskap i 1840 NN Kategori:Vitenskap i 1840 NB Categoria:1840 na ciência Portuguese

Category:1840 in science

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