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Protestant churches -- Pennsylvania -- Pittsburgh -- History -- 20th century
African Americans -- Pennsylvania -- Philadelphia -- History -- Sources
Riots -- Pennsylvania -- Christiana -- History -- 19th century
Fugitive slaves -- Pennsylvania -- Christiana -- History -- 19th century
Violence -- Pennsylvania -- Christiana -- History -- 19th century
African Americans -- Pennsylvania -- Christiana -- History -- 19th century
Pennsylvania -- History -- Revolution, 1775-1783 -- Social aspects
Immigrants -- Pennsylvania -- Philadelphia -- History -- 19th century
Irish Americans -- Pennsylvania -- Philadelphia -- History -- 19th century
Racism - Pennsylvania - Philadelphia - History - 19th century
Segregation -- Pennsylvania -- Philadelphia -- History -- 20th century
Trials (Libel) - Pennsylvania - Philadelphia - History - 18th century
Boys -- Pennsylvania -- Philadelphia -- Social conditions -- Case studies
Black power -- Pennsylvania -- Philadelphia -- History -- 20th century
Education -- Pennsylvania -- Philadelphia -- History -- 20th century
Families -- Medical care -- Pennsylvania -- Philadelphia -- Longitudinal studies
Poor -- Medical care -- Pennsylvania -- Philadelphi -- Longitudinal studies
African Americans -- Pennsylvania -- Philadelphia -- History -- 19th century
Prostitution -- Pennsylvania -- Philadelphia -- History -- 20th century
Vice control -- Pennsylvania -- Philadelphia -- History -- 20th century