In Russian. Polezhaev, Pyotr Vasilyevich. Compilation of tasks on network methods of organization of geological exploration works. Moscow: 1972. Sbornik zadach po setevym metodam organizatsii geologorazvedochnykh rabot. In Russian/Compendium of tasks on network methods of organization of geological exploration works. 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. SKU7330344