Short description: In Russian. Pokrovsky, Nikolai Mikhailovich. Normal drilling of vertical shafts in mines. Moscow: Ugletekhizdat, 1959. Prokhodka vertikal'nykh stvolov shakht obychnym sposobom. In Russian /Conventional drilling of vertical shafts . 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. SKU6455347