Material on this site can be located by using search terms or by categorically perusing the site’s offerings by the Universal Decimal Classification. The material the site locates is then made available by a link.
I randomly explored several of the scores of headings to see what was offered on each linked page. I found from as few as three linked listings to more than ten. There was something under each heading that I checked. If that holds true for the entire site, they have indeed done some serious work in putting this site together.
This site has a solid foundation in place that gives it the potential to grow into a very strong resource for on-line research. It will be interesting to watch it grow over time.