11 sites in Constructed
Bibliography of Planned Languages (Excluding Esperanto)
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List of books on interlinguistics, Volapük, Ido, Ro, Occidental, Novial, Interlingua, Glosa, modified English and Latin, pasigraphies, number languages, and other planned languages.
http://www.rickharrison.com/language/...
Forum - Usenet alt.language.artificial
See also
The category Constructedin other languages