Columbia subject headings:
Debts, Public--United States--States.
Natural resources.
United States--Economic conditions--1918-1945.
Harvard subject headings:
Debts, Public--United States--States
Natural resources--United States
United States--Economic conditions--1918-1945.
Princeton subject headings:
Debts, Public--United States--States.
Natural resources.
United States--Economic conditions--1933-.