Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Soviet Union 1923-40

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Start price: $75

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1934, Dmitry Mendeleyev, Famous Chemist, 5k-20k, complete set of four, blocks of four, CTO with full OG, mostly VF, C.v. $158++, Scott #536-39