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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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19 dic 1869 año - Открытие периодического закона химических элементов Д.И.Менеделеевым
Añadido al timeline:
Создание стрелы времени, отражающей стадии развития отечественной науки
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Кристина Фелиция
5 oct 2018
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622
fecha:
19 dic 1869 año
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~ 155 years ago
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