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    Soyuz 6 through Soyuz 8: Three Kniga Crew-Signed Covers with Certificate. An unprecedented occurrence was that all three of these spacecraft with seven cosmonauts aboard were in earth orbit at the same time in 1969, likely with the intention of docking but equipment failures prevented that from happening. Signed as follows.
    Soyuz 6: Georgi Shonin & Valeri Kubasov (later flew on Apollo-Soyuz)
    Soyuz 7: Anatoly Filipchenko, Vladislav Volkov (perished on Soyuz 11), & Viktor Gorgatko
    Soyuz 8: Vladimir Shatalov & Aleksei Yeliseyev
    Please note that these covers do not have clipped corners; the flaps have never been folded or sealed. Official COA included. Excellent.

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