In Russian. Ushakov, Sergey Alexandrovich. Geophysics about continental drift. Moscow: Knowledge, 1976. 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. SKU6956568
In Russian. Ushakov, Sergey Alexandrovich. Building and Development of the Earth. Moscow: 1974. 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. SKU7079873