Columbia subject headings:
Harvard subject headings:
Lincoln, Abraham, 1809-1865
Slavery--United States
United States--History--1849-1877.
United States--History--Civil War, 1861-1865
United States--History--Civil War, 1861-1865--Causes.
Princeton subject headings:
Lincoln, Abraham, 1809-1865.
Slavery--United States.
United States--History--1849-1877.
United States--History--Civil War, 1861-1865--Causes.
United States--History--Civil War, 1861-1865.