Keywords: Jews, East European Migrations 19th century ; History ; Jews, East European Migrations 20th century ; History ; Jews, East European Correspondence ; Jews, East European Correspondence ; Immigrants Correspondence ; Immigrants Correspondence ; Jews, East European Sources Migrations 20th century ; History ; Europe, Eastern Emigration and immigration 20th century ; History ; Europe, Eastern Emigration and immigration 19th century ; History ; Europe, Eastern Sources Emigration and immigration 20th century ; History ; Jews, East European ; Migrations ; History ; 19th century ; Jews, East European ; Migrations ; History ; 20th century ; Jews, East European ; United States ; Correspondence ; Jews, East European ; Palestine ; Correspondence ; Immigrants ; United States ; Correspondence ; Immigrants ; Palestine ; Correspondence ; Jews, East European ; Migrations ; History ; 20th century ; Sources ; Europe, Eastern ; Emigration and immigration ; History ; 19th century ; Europe, Eastern ; Emigration and immigration ; History ; 20th century ; Europe, Eastern ; Emigration and immigration ; History ; 20th century ; Sources ; Briefsammlung ; Briefsammlung ; Osteuropa ; Juden ; Auswanderung ; USA ; Palästina ; Geschichte 1875-1914