Columbia subject headings:
Collective bargaining--Monongahela River Region (W. Va. and Pa.)
Collective bargaining--Pennsylvania.
Collective bargaining--West Virginia.
Iron and steel workers--Monongahela River Region (W. Va. and Pa.)
Iron and steel workers--Pennsylvania.
Iron and steel workers--West Virginia.
Steel industry and trade--Monongahela River Region (W. Va. and Pa.)
Steel industry and trade--Pennsylvania.
Steel industry and trade--West Virginia.
Harvard subject headings:
Collective bargaining--Monongahela River Region (W. Va. and Pa.)
Collective bargaining--Pennsylvania.
Collective bargaining--West Virginia.
Iron and steel workers--Monongahela River Region (W. Va. and Pa.)
Iron and steel workers--Pennsylvania.
Iron and steel workers--West Virginia.
Steel industry and trade--Monongahela River Region (W. Va. and Pa.)
Steel industry and trade--Pennsylvania.
Steel industry and trade--West Virginia.
Princeton subject headings:
Collective bargaining--Monongahela River Region (W.Va. and Pa.).
Collective bargaining--Pennsylvania.
Collective bargaining--West Virginia.
Iron and steel workers--Monongahela River Region (W.Va. and Pa.).
Iron and steel workers--Pennsylvania.
Iron and steel workers--West Virginia.
Steel industry and trade--Monongahela River Region (W.Va. and Pa.).
Steel industry and trade--Pennsylvania.
Steel industry and trade--West Virginia.