Columbia subject headings:
Harvard subject headings:
Beaumaris (Port)--History.
Harbors--Wales
Harbors--Wales--Bangor--History.
Shipbuilding--Wales--Bangor--History--19th century.
Shipping--Wales--Bangor--History--19th century.
Princeton subject headings:
Bangor (Wales)--History.
Shipbuilding--Wales--Bangor--History.
Shipping--Wales--Bangor--History.