When Buenos Aires became the capital of the Republic, the Public Library of Buenos Aires became the National Library and Antonio Wilde was appointed as its director. Wilde’s tenure did not last long due to his old age and death after a sudden illness. Paul Groussac followed his directorship. Groussac created a methodical classification system based on Brunet’s bibliographic model, undertook the cataloging of the manuscript collection, and published two remarkable journals: La Biblioteca, being one of the most prestigious literary journals, and Los Anales de la Biblioteca.