Dutch esperantist (1887–1971)
Julia Catharina Isbrücker-Dirksen was a Dutch esperantist, Honorary Member of the Universal Esperanto Association (UEA), member of the International Central Committee and of the examination committee, member of the Soroptimist Club, president of the group in The Hague and wife of the vice-president of UEA Johannes Rijk Gerardus Isbrücker.
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