Columbia subject headings:
Harvard subject headings:
Clipper ships--New Hampshire--Portsmouth.
Navigation--New Hampshire--Portsmouth.
Portsmouth (N.H.)--History, Naval.
Shipbuilding--New Hampshire--Portsmouth.
Princeton subject headings:
Clipper ships--New Hampshire--Portsmouth.
Navigation--New Hampshire--Portsmouth.
Portsmouth (N.H.)--History, Naval.
Shipbuilding--New Hampshire--Portsmouth.