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File:Number of Esperanto association members by country (2015).svg - Wikimedia Commons
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L'esperanto
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Carte postale illustrée d'un dessin de dirigeable Zeppelin et rédigée... News Photo - Getty Images
Tarjeta postal redactada en lengua esperanto. Editada en Londres. Ludwig Lázaro Zamenhof (Bialystok, Rusia, 1859-Varsovia, 1917), médico oftalmólogo y creador de la lengua esperanto. Años 1910 Stock Photo - Alamy