Columbia subject headings:
Harvard subject headings:
Coal miners--Pennsylvania--Wyoming Valley--History.
Families--Pennsylvania--Wyoming Valley--History.
Labor unions--Pennsylvania--Wyoming Valley--History.
Working class--Pennsylvania--Wyoming Valley--History.
Wyoming Valley (Pa.)--History.
Princeton subject headings:
Coal miners--Pennsylvania--Wyoming Valley--History.
Families--Pennsylvania--Wyoming Valley--History.
Labor unions--Pennsylvania--Wyoming Valley--History.
Labor--Pennsylvania--Wyoming Valley--History.
Wyoming Valley (Pa.)--History.