Columbia subject headings:
Harvard subject headings:
Clipper ships--United States--History--19th century.
Merchant marine--United States--History--19th century.
Shipping--United States--History--19th century.
Princeton subject headings:
Clipper ships--United States--History--19th century.
Merchant marine--United States--History--19th century.
Shipping--United States--History--19th century.