※一部利用できない機能があります
1.
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{Translated from the Russian; edited by V. Dutt}
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2.
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Alexander von Humboldt ; bearb. von Hanno Beck.
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3.
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by Mary Proctor with eleven illustrations.
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4.
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Hoyle, Fred, Sir
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5.
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Schatzman, Evry L
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6.
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Mattersdorf, Leo, 1903-
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7.
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Stephen Toulmin and June Goodfield.
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