In Russian. Borisova, Alla Ivanovna. Economic Efficiency of Geological Prospecting for Oil and Gas. Moscow: Nedra, 1979 Ekonomicheskaya effektivnost geologo-poiskovykh rabot na neft i gaz/Economic Efficiency of Oil and Gas Exploration In Russian. 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. SKU7651761