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http://aranylaci.freeweb.hu/spacedogs/spacedogs.htm
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https://spacejunkie.hu/2020/08/19/60-eve-indult-bjelka-es-sztrelka/
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https://www.azenkutyam.hu/elet/bjelka-es-sztrelka/
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https://en.wikipedia.org/wiki/Bruce_Cooper
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https://en.wikipedia.org/wiki/Leslie_L._Irvin
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https://www.nae.edu/189195/ADOLF-BUSEMANN-19011986
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https://en.wikipedia.org/wiki/Adolf_Busemann
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https://de.wikipedia.org/wiki/Adolf_Busemann_(Ingenieurwissenschaftler)
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https://hu.wikipedia.org/wiki/Sébastien_Le_Prestre_de_Vauban
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https://www.pont-transbordeur.fr/
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