Columbia subject headings:
Baltimore and Ohio Railroad Company.
Maryland--Description and travel.
Ohio--Description and travel.
Virginia--Description and travel.
Harvard subject headings:
Baltimore and Ohio Railroad Company.
Maryland--Description and travel.
Ohio--Description and travel.
Virginia--Description and travel.
Princeton subject headings:
Baltimore and Ohio Railroad Company.
Maryland--Description and travel.
Ohio--Description and travel.
Virginia--Description and travel.