Tag: Petr Semenov-Tian-Shansky Death anniversary

26 February: Tribute to Petr Semenov-Tian-Shansky

Petr Semenov-Tian-Shansky (14 January 1827 – 26 February 1914) was a Russian

14 January: Remembering Petr Semenov-Tian-Shansky on Birth Anniversary

Petr Semenov-Tian-Shansky (14 January 1827 – 26 February 1914) was a Russian