The Institute for the History of the German Jews (Institut für die Geschichte der deutschen Juden – IGdJ) focuses on German-Jewish history with special emphasis on the interrelations between local and transnational history, migration history, Jewish history during National Socialism, and Jewish heritage. For Yerusha, the Institute has described all the relevant collections held by non-Jewish archives in Northern Germany, that have Jewish-related documents and community records. The geographical scope includes the cities of Hamburg and Bremen as well as the states of Schleswig-Holstein, Lower Saxony, and Mecklenburg–West Pomerania.