Columbia subject headings:
Editors--Prussia, East (Poland and Russia)--Biography.
Ethnic press--Prussia, East (Poland and Russia)--History.
Jaroszyk, Kazimierz, 1878-1941.
Prussia, East (Poland and Russia)--History.
Harvard subject headings:
Editors--Prussia, East (Poland and Russia)--Biography.
Ethnic press--Prussia, East (Poland and Russia)--History.
Jaroszyk, Kazimierz, 1878-1941.
Prussia, East (Poland and Russia)--History.
Princeton subject headings:
Jaroszyk, Kazimierz, 1878-1941.
Journalists--Poland--Biography.
Polish people--Prussia, East (Poland and Russia)--Biography.