Currency crises in post-Soviet economies — a never ending story? - ScienceDirect
What was the equivalent of Soviet Union rubles to dollars in 1973? I know officially it was -1 ruble 0.7 dollar, but it was wrong. What was the reality? - Quora
5 Ruble Banknote | Soviet Union | Lenin | Socialism | Hammer and Sickle | 1961 | eBay