Columbia subject headings:
Harvard subject headings:
Coal mine accidents--Pennsylvania--Wyoming Valley--History.
Coal miners--Labor unions--Pennsylvania--Wyoming Valley--History.
Coal miners--Pennsylvania--Wyoming Valley--History.
Ethnology--Pennsylvania--Wyoming Valley--History.
Wyoming Valley (Pa.)--Social conditions.
Princeton subject headings:
Coal miners--Labor unions--Pennsylvania--Wyoming Valley--History.
Coal miners--Pennsylvania--Wyoming Valley--History.
Coal mines and mining--Pennsylvania--Wyoming Valley--Accidents--History.
Ethnology--Pennsylvania--Wyoming Valley--History.
Wyoming Valley (Pa.)--Social conditions.