Columbia subject headings:
Collective bargaining--Railroads--United States--Bibliography.
Industrial relations--United States--Bibliography.
Railroads--Employees--Bibliography.
Harvard subject headings:
Collective bargaining--Railroads--United States--Bibliography.
Industrial relations--United States--Bibliography.
Railroads--Employees--Bibliography.
Princeton subject headings:
Collective bargaining--Railroads--United States--Bibliography.
Industrial relations--United States--Bibliography.
Railroads--Employees--Bibliography.