Columbia subject headings:
Trading with the enemy.
World War, 1914-1918--Economic aspects--United States.
World War, 1914-1918--Law and legislation--United States.
Harvard subject headings:
Trading with the enemy
World War, 1914-1918--Economic aspects--United States
World War, 1914-1918--Law and legislation--United States
Princeton subject headings:
Trading with the enemy.
World War, 1914-1918--Economic aspects--United States.
World War, 1914-1918--Law and legislation--United States.