Columbia subject headings:
Railroads and state--United States.
Railroads--United States.
United States Railroad Administration.
World War, 1914-1918--Transportation.
Harvard subject headings:
Railroads and state--United States.
Railroads--United States
United States Railroad Administration.
World War, 1914-1918--Transportation
Princeton subject headings:
Railroads and state--United States.
Railroads--United States.
United States Railroad Administration.
World War, 1914-1918--Transportation.