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https://en.wikipedia.org/wiki/Nikolai_Nikolaevich_Polikarpov
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https://en.wikipedia.org/wiki/Grigori_Shtern
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http://isni.org/isni/0000000043075759
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https://id.loc.gov/authorities/names/no88005265
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https://viaf.org/viaf/21698170
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https://www.worldcat.org/identities/containsVIAFID/21698170
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https://hu.wikipedia.org/wiki/Csingtao_ostroma
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https://en.wikipedia.org/wiki/Siege_of_Tsingtao
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https://hu.wikipedia.org/wiki/SMS_Kaiserin_Elisabeth
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https://en.wikipedia.org/wiki/SMS_Kaiserin_Elisabeth
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