In search of traces of the Königsberg library, the association “Jews in East Prussia” drove to Jerusalem and visited Dr. Irene Shirun-Grumach on 9 February 2019. Her father, Ernst Grumach, was employed in the book collection of the RSHA from 1941 to 1943. She was allowed to visit him there once among the many books. Dr. Shirun-Grumach gave his documentation of this time to the Central Archive for the History of Jewish People. There you can read and research about it.