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aeronautics
20. století
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53
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6
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Northwest
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Pacific
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Pacific -- History -- 20th Century
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Russia
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Soviet science
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Umberto Nobile
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United States -- State History -- National Topics -- Northwest
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United States. Navy
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Walther Bruns
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aeroplanes
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airship building
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airships
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ambassador
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aviators
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commercial - chartering - bathurst island
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development of the Arctic
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flight
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harbours
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meteorological
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north pole
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scientific diplomacy
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seaplanes
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severní pól
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vzducholodě
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vzduchoplavba
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Вальтер Брунс
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