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- Barricades (Military science)[remove]3
- Police patrol.2
- Strikes and lockouts--California--San Francisco.2
- Ambulances.1
- Battles1
- Labor unions--United States.1
- Merriam, Frank Finley, 1865-1955.1
- Painting1
- Police--United States.1
- Politics and culture--United States--History--20th century.1
- Ships1
- Tanks (Military science)1
- Tear gas.1
- United States--History--Revolution, 1775-17831
- United States. National Guard Bureau.1