In Russian. Zimagulov, Anas Khafizovich. Improvement of traction and coupling qualities of wheeled tractors. Kazan: Tatar book edition, 1975. Povyshenie tyagovo-stsepnykh kachestv kolesnykh traktorov. In Russian /Improving traction performance of wheeled tractors. 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. SKU6925705