Keywords: Nikolai Prokopievich Chizhevsky by Lenkovs Tomsk 1909.png en Russian scientist metallurgy and coke Nikolay Tchizhevsky photo by P and L Lenkov Tomsk Russia 1909 1909-12-31 Archive of Russian Academy of sciences f 1598 119 d 1880 ”1967 P and L Lenkov as shown on photo other versions PD-old-70-1923 Uploaded with UploadWizard Uncategorized 2015 December 27 |