Below a record is the block Related documents. There, Open Archives automatically searches for other records and information about the same persons. You do not have to search yourself.
This automatic search takes computing power. That is why Open Archives only does this for logged-in users. An account is free.
With a Plus subscription you let Open Archives search for the parents, grandparents and further ancestors from one record. The result is a pedigree. Searching for children can also be done automatically.
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Find your ancestors and publish your family tree on Genealogy Online via https://www.genealogieonline.nl/en/