And clicking on "Other Miscellaneous Documents" expands the previous section instead ("Software & Technical Manuals").
The top link (batch Nov 2017) also somehow 404.
Guess that explains why when you click on english language books the first time, it loads them. Click on something else it page reloads with no change. Or maybe it doesnt explain that at all. Very antiquated site.
Half the links are also incorrect. Change the start variable in the URL if you can't open the section you want.
joomla in a nutshell
That joker almost certainly == the lowest bidder in what was like ya terrible government requisition process for a website.