Columbia subject headings:
Lincoln, Abraham, 1809-1865.
United States--History--Civil War, 1861-1865.
United States. Military Telegraph Corps.
Harvard subject headings:
Lincoln, Abraham, 1809-1865
United States--History--Civil War, 1861-1865
United States. Military Telegraph Corps.
Princeton subject headings:
Lincoln, Abraham, 1809-1865.
United States--History--Civil War, 1861-1865.
United States. Military Telegraph Corps