Short description: In Russian. Smirnov, Nikolai Nikolaevich. Petrographic research in carbon near Moscow. Moscow: Association of Scientific and Research Institutes at Physical and Mathematical Faculty 1 M.G.U., 1930: type of gas. Pravda. The image is provided for reference only. It may reflect condition of one of the available copies or only help in identifying the edition. Please feel free to contact us for a detailed description of the copies available. SKU9237705