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- African American civil rights workers--Pennsylvania--Pittsburgh3
- African Americans--Civil rights--Pennsylvania--Pittsburgh3
- Civil rights movements--Pennsylvania--Pittsburgh3
- Civil rights workers--Pennsylvania--Pittsburgh3
- Demonstrations--Pennsylvania--Pittsburgh3
- Picketing--Pennsylvania--Pittsburgh3
- Prison administration--Pennsylvania--Pittsburgh3
- Railroad tracks--Pennsylvania--Pittsburgh[remove]3
- Signs and signboards--Pennsylvania--Pittsburgh3
- Women--Pennsylvania--Pittsburgh3
- Boys--Pennsylvania--Pittsburgh2
- Civil rights demonstrations--Pennsylvania--Pittsburgh2
- Men--Pennsylvania--Pittsburgh2
- Black power1
- Black power--Pennsylvania--Pittsburgh1