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Ambulances.
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1
Barricades (Military science)
1
Labor unions--United States.
1
Merriam, Frank Finley, 1865-1955.
1
Police patrol.
1
Politics and culture--United States--History--20th century.
1
Strikes and lockouts--California--San Francisco.
1
Tear gas.
1
United States. National Guard Bureau.
1