Columbia subject headings:
Depressions--1929--France.
Depressions--1929--Germany.
Depressions--1929--Great Britain.
Depressions--1929--United States.
Harvard subject headings:
Depressions--1929--France.
Depressions--1929--Germany.
Depressions--1929--Great Britain.
Depressions--1929--United States
Princeton subject headings:
Depressions--1929--France.
Depressions--1929--Germany.
Depressions--1929--Great Britain.
Depressions--1929--United States.