Columbia subject headings:
Harvard subject headings:
Argentina--Foreign relations--United States.
Argentina--Politics and government--1860-1910.
Roca, Julio Argentino, 1843-1914
United States--Foreign relations--Argentina.
Princeton subject headings:
Argentina--Foreign relations--United States.
Argentina--Politics and government--1860-1910.
Roca, Julio Argentino, 1843-1914.
United States--Foreign relations--Argentina.