Columbia subject headings:
Americans--Ireland--History--19th century.
Douglass, Frederick, 1818-1895--Travel--Ireland.
Freed persons--United States--History--19th century.
Slavery--United States--History--19th century.
Harvard subject headings:
Americans--Ireland--History--19th century.
Douglass, Frederick, 1818-1895--Travel--Ireland.
Freed persons--United States--History--19th century.
Slavery--United States--History--19th century
Princeton subject headings:
Americans--Ireland--History--19th century.
Douglass, Frederick, 1818-1895--Travel--Ireland.
Freed persons--United States--History--19th century.
Slavery--United States--History--19th century.