Open Archives
You have searched for persons in records with helfferich in the name, this gives 1,143 search results.
Find your ancestors and publish your family tree on Genealogy Online via https://www.genealogieonline.nl/en/
You can instruct Open Archives to monitor this search. When there are new search results you will be notified by e-mail.
The results of the search can be downloaded in PDF and GEDCOM format.
To use this functionality, you must have a subscription and be logged in.
You can download the result list in spreadsheet format (CSV or XLS). This is possible up to a maximum of 10,000 results.