Columbia subject headings:
America--Discovery and exploration.
Food habits--America--History.
Food habits--Europe--History.
Food--America--History.
Food--Europe--History.
Harvard subject headings:
America--Relations--Europe.
Europe--Civilization--American influences
Europe--Relations--America.
Food habits--Europe--History
Plant introduction--Europe--History.
Plants, Cultivated--America--History.
Princeton subject headings:
America--Relations--Europe.
Europe--Civilization--American influences.
Europe--Relations--America.
Food habits--Europe--History.
Plant introduction--Europe--History.
Plants, Cultivated--America--History.