File:Письмо Петра Ершова Дмитрию Менделееву 13 августа 1858 года.jpg

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Русский: Письмо Петра Ершова Дмитрию Менделееву 13 августа 1858 года
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Source Наука и жизнь. - 2020. - № 6. - С. 133; Научный архив Менделеева в СПбГУ
Author Петр Павлович Ершов

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