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Sir William Ramasay Period (28 дек 1894 г. – 8 март 1898 г.)

Описание:

This is when Sir William Ramsay was reaserching the atomic elements known as the noble gases which is now a new family of elements.

Добавлено на ленту времени:

14 сен 2017
0
0
646

Дата:

28 дек 1894 г.
8 март 1898 г.
~ 3 years and 2 months

Изображения: