Columbia subject headings:
Betances, Ramón Emeterio, 1827-1898.
Cuba--History--1878-1898--Sources.
Puerto Rico--History--To 1898--Sources.
Harvard subject headings:
Betances, Ramón Emeterio, 1827-1898--Correspondence.
Cuba--History--1878-1895.
Cuba--History--Revolution, 1895-1898--Refugees.
Nationalists--Puerto Rico--Correspondence.
Political refugees--Cuba--History--19th century.
Political refugees--France--Paris--History--19th century.
Political refugees--Puerto Rico--History--19th century.
Puerto Rico--History--To 1898.
Princeton subject headings:
Betances, Ramón Emeterio, 1827-1898.
Cuba--History--1878-1898--Sources.
Puerto Rico--History--To 1898--Sources.