Andrei Petrovich Semyonov-Tyan-Shansky

Russian and Soviet geographer, entomologist. There are two letters of S. M. Prokudin-Gorsky to A.P. Semenov-Tyan-Shansky from year 1907 (Archive of the Russian Academy of Sciences. St. Petersburg branch. F. 722. Op. 002. D. 862).