Columbia subject headings:
Betances, Ramón Emeterio, 1827-1898.
Politicians--Puerto Rico--Correspondence.
Puerto Rico--History--To 1898--Sources.
Harvard subject headings:
Betances, Ramón Emeterio, 1827-1898.
Politicians--Puerto Rico--Correspondence.
Puerto Rico--History--To 1898--Sources.
Princeton subject headings:
Betances, Ramón Emeterio, 1827-1898--Correspondence.