Columbia subject headings:
Harvard subject headings:
Labor movement--Pennsylvania--Philadelphia--History.
Labor movement--Religious aspects--Christianity--History.
Labor unions--Religious aspects--Christianity--Pennsylvania--Philadelphia--History.
Labor--Religious aspects--Christianity--Pennsylvania--Philadelphia--History.
Princeton subject headings:
Labor movement--Pennsylvania--Philadelphia--History.
Labor movement--Religious aspects--Christianity--History.
Labor unions--Religious aspects--Christianity--Pennsylvania--Philadelphia--History.
Labor--Religious aspects--Christianity--Pennsylvania--Philadelphia--History.