In Russian. Chirkov, Nikolai Nikolaevich. Defining Angles. Leningrad: 1970. 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. SKU7072369
In Russian. Chirkov, Nikolai Nikolaevich. Measurement of distances. Leningrad: 1971. 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. SKU7072368