Columbia subject headings:
Harvard subject headings:
Cuba--History--1878-1895.
Cuba--History--Insurrection, 1868-1878.
Espionage, Spanish--United States.
Martí, José, 1853-1895.
Ponce de León, Néstor, 1837-1899--Diaries.
Princeton subject headings:
Cuba--History--1810-1899.
Martí, José, 1853-1895.
Pinkerton's National Detective Agency.
Ponce de León, Néstor, 1837-1899.