Marriage certificates from LINKS available at WieWasWie
CBG Center for family history and the IISH have joined forces. They have been doing that for a while, but now we can share some special result, both for scientists as for the general public.
You can now build up your family tree in a shorter period of time from the introduction of the Civil Registry and establish relationships, which at first had not (simply) emerged.
The IISH provides the data for this.