Columbia subject headings:
Steamboat lines--United States--History--Periodicals.
Steamboat lines--United States--Periodicals.
Steamboats--Periodicals.
Harvard subject headings:
Steamboat lines--United States--History--Periodicals.
Steamboat lines--United States--Periodicals.
Steamboats--Periodicals.
Princeton subject headings:
Steamboat lines--United States--History--Periodicals.
Steamboat lines--United States--Periodicals.
Steamboats--Periodicals.