Columbia subject headings:
Deacons--Germany--Rhineland--History.
Duisburg (Germany)--Church history.
Fliedner, Theodor, 1800-1864.
Theodor Fliedner Werk--History.
Harvard subject headings:
Church charities--Germany--Duisburg.
Deacons--Germany--Duisburg--History--20th century.
Duisburg (Germany)--Church history.
Fliedner, Theodor, 1800-1864.
Princeton subject headings: