Columbia subject headings:
Greenhow, Rose O'Neal, 1814-1864.
United States--History--Civil War, 1861-1865--Prisoners and prisons.
United States--History--Civil War, 1861-1865--Secret service--Confederate States of America.
Harvard subject headings:
Greenhow, Rose O'Neal, 1814-1864--Imprisonment.
Greenhow, Rose O'Neal, 1814-1864.
Spies--Confederate States of America--Biography.
United States--History--Civil War, 1861-1865--Prisoners and prisons.
United States--History--Civil War, 1861-1865--Secret service--Confederate States of America.
United States--History--Civil War, 1861-1865--Secret service.
Princeton subject headings:
Greenhow, Rose O'Neal, 1814-1864.
United States--History--Civil War, 1861-1865--Prisoners and prisons.
United States--History--Civil War, 1861-1865--Secret service--Confederate States.