https://www.jrank.org/encyclopedia/pages/cm7kwge6q3/Ballet.html
Ballet - Dance, Russian, Dancers, and Diaghilev - JRank Articles
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https://www.themoscowtimes.com/2019/08/19/sergey-diaghilev-remembered-90-years-after-his-death-a66931
Sergey Diaghilev, Remembered 90 Years After His Death - The Moscow Times
May 15, 2026 - Video | Sergey Diaghilev, the renowned Russian ballet impresario, died 90 years ago on Aug. 19, 1929. His influence continues to be felt today.
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https://www.abebooks.com/first-edition/Nijinsky-Karsavina-Diaghilev-Ballet-1909-1914-Exhibition/31175511081/bd
Nijinsky, Karsavina and the Diaghilev Ballet 1909-1914. Exhibition of Drawings By Valentine Gross...