Columbia subject headings:
Atlantic Ocean--Navigation--History--Congresses.
Transatlantic voyages--History--Congresses.
Voyages and travels--History--Congresses.
Harvard subject headings:
America--Emigration and immigration--History.
Explorers--Atlantic Ocean--History.
Princeton subject headings:
Atlantic Ocean--Navigation--History--Congresses.
Transatlantic voyages--History--Congresses.
Voyages and travels--History--Congresses.