From the collections of the International Esperanto Museum, Montagu C. Butler library, Centre de documentation et étude sur la langue internationale, and the German Esperanto Library, the Hector Hodler Library is one of the largest Esperanto libraries, with approximately 20,000 books, with periodicals, manuscripts, photos, music, and other collections. It occupies three rooms in the central office of the Universal Esperanto Association in Rotterdam, Netherlands.

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