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== Nexus externi ==
{{Commonscat|Esperantomuseum|Museum linguae Esperanticae Vindobonense}}
* [https://www.onb.ac.at/museen/esperantomuseum/ Museum Linguae Esperanticae]
* [https://www.onb.ac.at/bibliothek/sammlungen/plansprachen/ Collectus linguarum artificiosarum]
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