They're pages from Codex Seraphinianus, it's similar to the Voynich Manuscript only it describes an entire imaginary world. The language has never been deciphered though the numbering system is some kind of base 21.
Found on an old bookchan thread.
Codex Seraphinianus
http://megaupload.com/?d=OW5SH8NM
Voynich Manuscript
http://rapidshare.com/files/35438072/Voynich_Manuscript.zip.html