Topic
- Protest movements22
- Teachers22
- Vietnam War, 1961-197522
- Youth22
- Parades21
- Sit-down strikes18
- Buildings16
- Dodge Division16
- Flags16
- Maps15
- Buses14
- Meat industry14
- Police Dept.14
- Veterans13
- Bus drivers12
- Political candidates12
- Politicians12
- Street-railroads12
- United States Capitol (Washington, D.C.)12
- Washington (D.C.)12