In Russian. Filippov, Georgy Vasilievich. Drilling deep holes with spiral drills with internal drainage of CO2. Leningrad: Leningrad Organization of the RSFSR Znanie, LDNTP, 1974. Sverlenie glubokikh otverstiy spiral'nymi sverlami s vnutrennim otvodom SOZh. In Russian /Drilling deep holes with spiral drills with internal drainage of CO2. All images are for identification of editions only. Several books of the same edition may be available. Please feel free to request photos of available books. SKU7063538