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• Science: Social Sciences: Linguistics  (5,305)
• Society: Politics: Liberalism  (613)

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• Liberal Thinkers: Wilhelm von Humboldt - A short biography from the site of Liberal International.
• The Sphere and Duties of Government (The Limits of State Action) - Humboldt's book on political philosophy examining the tasks of the state.
• Wilhelm von Humboldt - Brief eulogy with picture at Humboldt University's website.
• Wilhelm von Humboldt (1767-1835) - A biography.
• Wilhelm von Humboldt Quotes - Short list of quotations at BrainyQuote.com.