Columbia subject headings:
Agriculture--Great Britain.
Agriculture--United States.
World War, 1914-1918--Food supply--Great Britain.
World War, 1914-1918--Food supply--United States.
Harvard subject headings:
Agriculture--Great Britain
Agriculture--United States
World War, 1914-1918--Food supply--Great Britain
World War, 1914-1918--Food supply--United States
Princeton subject headings:
Agriculture--Great Britain.
Agriculture--United States.
World War, 1914-1918--Food supply--Great Britain.
World War, 1914-1918--Food supply--United States.