Columbia subject headings:
Esra (Association)
Jewish youth--Germany--Societies, etc.
Jews--Germany--Social life and customs.
Orthodox Judaism--Germany--History.
Harvard subject headings:
Esra (Association)
Jewish youth--Germany--Societies and clubs--History.
Jews--Germany--History--1800-1933.
Orthodox Judaism--Germany--History--20th century.
Princeton subject headings:
Esra (Association)
Jewish youth--Germany--Societies and clubs--History--20th century.
Youth movements--Germany--History--20th century.