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| Russian | English |
| неразведанные запасы | nondiscovered reserves (MichaelBurov) |
| неразведанные запасы | non-discovered reserves (MichaelBurov) |
| неразведанные запасы | yet-to-find reserves (reserves = proved reserves + yet-to-find (undiscovered) reserves Ksylena) |
| неразведанные технически извлекаемые запасы | undiscovered technically recoverable reserves (О. Шишкова) |