Columbia subject headings:
Aberdyfi (Wales)--Commerce--History.
Amity (Ship)--History.
Coastwise shipping--Wales--History.
Harvard subject headings:
Aberdyfi (Wales)--Commerce--History.
Amity (Ship)--History.
Coastwise shipping--Wales--History.
Princeton subject headings:
Amity (Ship)--History--Sources.
Shipping--Wales--Aberdovey (Gwynedd)--History--Sources.