I've just done a quick-and-dirty update of the Math Guide to v3.4
(complete with fancy new front page) and put it on the wiki,
https://wiki.documentfoundation.org/Documentation/Publications
It's also on ODFAuthors under Math Guide 3.4 > Drafts.
That distracted me from working on the compiled Writer Guide, but I'm
getting back to it now.
--Jean