Try the standards disk for $30. Its not bad at CCITT/ITU material, even
though it
was gleaned originally from the net. You get RFCs etc for free, as usual. It
may
be the other way around, however. The authenticity of the standards is
somewhat in doubt, for paranoids. The modernity of the ISO/ITU material is
haphazard.
I seem to recall that the CCITT/ITU material had to be removed in the latest
version (it's at home at the moment so I can't check), so you may need to try
to get one second-hand, or see if anyone is still carrying older versions.
Peter.