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Alexander von Humboldt patron of science
- "Alexander von Humboldt : patron of science"
- "Alexander von Humboldt patron of science"@en
- "Alexander von Humboldt, patron of science. [With illustrations.]"
- "Alexander von Humboldt, patron of science. [With illustrations.]"@en
- "Alexander von Humboldt, patron of science, by E. R. Brann"
- "Alexander von Humboldt, patron of science"@en