Columbia subject headings:
Hamburg (Germany)--Ethnic relations.
Jews--Germany--Hamburg--Correspondence.
Jews--Germany--History--1933-1945.
Harvard subject headings:
Jews--Germany--Hamburg--Biography.
Orthodox Judaism
Perlmann, Benjamin, 1876-1942--Correspondence.
Perlmann, Elsa, 1880-1942--Correspondence.
Princeton subject headings:
Hamburg (Germany)--Ethnic relations.
Jews--Germany--Hamburg--Correspondence.
Jews--Germany--History--1933-1945.