Columbia subject headings:
African Americans--Biography.
Higginson, Thomas Wentworth, 1823-1911.
Harvard subject headings:
Abolitionists--United States--Biography
Higginson, Thomas Wentworth, 1823-1911.
Unitarians--United States--Clergy--Biography.
United States--History--Civil War, 1861-1865--African Americans
Princeton subject headings:
Higginson, Thomas Wentworth, 1823-1911.