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Subject
- Automobiles.[remove]3
- White House (Washington, D.C.)2
- American Federation of Labor.1
- Cable cars (Streetcars)1
- Diplomats.1
- Green, William, 1870-1952.1
- Hoover, Herbert, 1874-1964.1
- Hoover, Lou Henry, 1874-1944.1
- Megaphones.1
- Motorcades.1
- Ortiz Rubio, Pascual, 1877-1963.1
- Pennsylvania Avenue (Washington, D.C.).1
- Police training--United States.1
- Politicians.1
- Public safety.1
- Roosevelt, Franklin D. (Franklin Delano), 1882-1945.1
- Strikes and lockouts.1
- Traffic safety.1
- United States Capitol (Washington, D.C.)1
- Washington Monument (Washington, D.C.)1