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1by Humboldt, Alexander von, 1769-1859Subjects: “...Explorers Germany Biography....”
Published 1959
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2by Baack, Lawrence J.Subjects: “...Explorers Germany 18th century Biography....”
Published 2014
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3Published 2014Subjects: “...Explorers Germany Biography....”
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4
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5Published 1984“...Outer space Exploration Germany (West)...”
Government Document Book