Columbia subject headings:
Argentina--Politics and government--1860-1910.
Communism--Argentina.
Working class--Argentina.
Harvard subject headings:
Argentina--Politics and government--1860-1910.
Communism--Argentina
Labor and laboring classes--Argentina.
Labor--Argentina
Working class--Argentina
Princeton subject headings:
Argentina--Politics and government--1860-1910.
Communism--Argentina.
Working class--Argentina.