I am very unclear on what it is you’re asking. Could you at least give us a link to the specific web page on which there is the PDF file you want to download? I had to ask Google for which site you even meant, and it seems to be one somebody made ca. 1999 and never really updated (UI-wise).
I found
this bit about the C12 by browsing around the site, but that’s about it on a non-exhaustive search. It doesn’t seem to have a link to a PDF that you talk about, though.