Very nice, rare genuine stamps.
Aljeksandr Pjetrovič Karpinskij ( 7 January 1847 (NS) – 15 July 1936) was a prominent Russian and Soviet geologist and mineralogist, and the president of the Russian Academy of Sciences, and later Academy of Sciences of the USSR, in 1917–1936.He was invited to the Mining Institute, St. Petersburg in 1869 as an Assistant Professor, whilst also doing further studies and research. He was given full professorship in 1877. He stayed there until 1885. He was the imperial director of mining research from 1885 to 1916. Karpinsky was elected to the Russian Academy of Sciences in 1886, was elected its president in May 1917, and held this title until his death. His main research was chiefly done in the Ural Mountains, and he completed the first geological map of European Russia. He was able to preserve much scientific equipment and many invaluable records during the turmoil, and looting, of the Russian Revolution.