Why is Esperanto worthy of the role World Second Language?
Why are national or ethnic languages not worthy of the role World Second Language?
Esperanto Friends' Best Link
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ESPERANTO MUSEUM/ Wikipedia (scroll to link below photo)
The Esperanto Museum in Austria is a vast source on Esperanto. Read about it and go to its links. Try the bild-arkivo or bildarchiv for thousands of still pictures out of the history of Esperanto. (some clarifications are in German at the Austrian site)