Welcome Sigert!
AFAIC, I bought the lists from Labs etc, or I got them included with the softwares (ODEON - Combined industrial and auditorium for ex). For some specific ones, I paid to have private measurements done.
They do tend to get a bit crowded and confusing...
Other interesting infos (when available) are of resilience / elasticity, density, Fire rated or not etc.
Lots of lists are available on the net I think, the problem being that the source is often omitted, which doesn't always make them very solid.