Short description: In Russian. Pokrovsky, Georgy Iosifovich. Clutch friction in the ground. Moscow Leningrad: Gosstroyizdat, 1941 (Leningrad). Trenie s stseplenie v gruntakh. In Russian /Friction with adhesion in the ground . 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. SKU5247741