Columbia subject headings:
Railroads--United States--History--Sources.
Railroads--United States.
United States. Office of the Commissioner of Railroads--Archives--Catalogs.
United States. Office of the Commissioner of Railroads--Bibliography.
United States. Pacific Railway Commission--Archives--Catalogs.
United States. Pacific Railway Commission--Bibliography.
Harvard subject headings:
Archives--United States--Catalogs
Railroads--United States
Railroads--United States--History--Sources.
United States. Office of Commissioner of Railroads--Archives--Catalogs.
United States. Office of the Commissioner of Railroads--Bibliography.
United States. Pacific Railway Commission--Archives--Catalogs.
United States. Pacific Railway Commission--Bibliography.
Princeton subject headings: