Columbia subject headings:
African American iron and steel workers--Pennsylvania--History.
African Americans--Employment--Pennsylvania--History.
Discrimination in employment--Pennsylvania--History.
Harvard subject headings:
African American iron and steel workers--Pennsylvania--History.
African Americans--Employment--Pennsylvania--History.
Discrimination in employment--Pennsylvania--History.
Princeton subject headings:
African American iron and steel workers--Pennsylvania--History.
African Americans--Employment--Pennsylvania--History.
Discrimination in employment--Pennsylvania--History.