Census Records for Schleswig-Holstein: https://sites.google.com/site/schleswigholsteincensus/schleswig-holstein-census-records
https://tockify.com/genealogy.events/monthly
https://iggp.org/german-genealogy-resources-map/
https://www.martin-opitz-bibliothek.de/en/
https://iggp.org/german-genealogy-resources-map/