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Wiki information Leontyevich:
Vladimir Leontyevich Komarov was a Russian botanist. Until his death in 1945, he was senior editor of the Flora SSSR, in full comprising 30 volumes published between 1934–1960. He was elected a corresponding member of the Russian Academy of Sciences...
Mikhail Leontyevich Mil was a Soviet aerospace engineer. He founded the Mil Moscow Helicopter Plant, which is responsible for many well-known Soviet helicopter models.