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English citations of Volapük
2004, Steven Roger Fischer, A history of language, Reaktion Books, ISBN 9781861890801, page 180:
- The first practical constructed language was the south-west German Pastor Schleyer's Volapük from 1879; its complicated grammar and irregular vocabulary made learning difficult, however. The most successful has been Esperanto, devised by the Warsaw ophthalmologist Ludwig Zamenhof in 1887, that today can count some one million speakers.