Columbia subject headings:
Harvard subject headings:
Engelberg, Ernst--Correspondence.
Engelberg, Ernst--Friends and associates.
Germany (East)--Intellectual life.
Germany--Intellectual life--20th century.
Historians--Germany (East)--Biography.
Publishers and publishing--Germany--Berlin--Biography.
Siedler, Wolf Jobst--Correspondence.
Siedler, Wolf Jobst--Friends and associates.
Princeton subject headings:
Engelberg, Ernst--Correspondence.
Engelberg, Ernst--Friends and associates.
Germany (East)--Intellectual life.
Germany--Intellectual life--20th century.
Historians--Germany (East)--Biography.
Publishers and publishing--Germany--Berlin--Biography.
Siedler, Wolf Jobst--Correspondence.
Siedler, Wolf Jobst--Friends and associates.