This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Entwicklung der Normdaten de. Vorlage Normdatenno Zahlen nach de Vorlage NORMDATENCOUNT bzw der Versionsgeschichte Bereinigt um offensichtliche Ausreier Erstellt mit Gnuplot own Schnark cczero Uploaded with German statistics VIAF inter project linking
Page 2023 Free-images.com. All images are Public Domain