hxxp://rm822.dyndns.org:99/Books/
hxxp://ushus.princeton.edu/~nair/dedekind/books.pdox.net/
hxxp://podgoretsky.com/ftp/Docs/
hxxp://www.maththinking.com/boat/computerbooks.html
hxxp://www.flazx.com/
hxxp://giuciao.atspace.org/books/
fxp://dimm.d2g.com/Books/