Columbia subject headings:
Harvard subject headings:
African Americans--History--Sources.
Lincoln, Abraham, 1809-1865--Relations with African Americans.
Lincoln, Abraham, 1809-1865--Views on Afro-Americans.
Lincoln, Abraham, 1809-1865--Views on slavery.
Slavery--United States--History--Sources.
United States--History--Civil War, 1861-1865--Sources.
Princeton subject headings:
African Americans--History--Sources.
Lincoln, Abraham, 1809-1865.
Slavery--United States--History--Sources.
United States--History--Civil War, 1861-1865--Sources.