Columbia subject headings:
United States--History--Civil War, 1861-1865--Blockades.
United States--History--Civil War, 1861-1865--Naval operations.
Harvard subject headings:
United States--History--Civil War, 1861-1865--Blockades.
United States--History--Civil War, 1861-1865--Naval operations.
Princeton subject headings:
United States--History--Civil War, 1861-1865--Blockades.
United States--History--Civil War, 1861-1865--Naval operations.