Columbia subject headings:
Famines--Ireland--History--19th century.
Immigrants--United States--History--19th century.
Ireland--Emigration and immigration--History--19th century.
Ireland--History--Famine, 1845-1852.
Irish Americans--History--19th century.
Ocean travel--History--19th century.
United States--Emigration and immigration--History--19th century.
Harvard subject headings:
Ireland--Emigration and immigration--History--19th century.
Irish--United States--History--19th century.
Ocean travel--History--19th century
United States--Emigration and immigration--History--19th century.
Princeton subject headings:
Canada--Emigration and immigration--History--19th century.
Ireland--Emigration and immigration--History--19th century.
Ireland--History--Famine, 1845-1852.
United States--Emigration and immigration--History--19th century.