The collection consists of the entire library and political archive of the Agencia Noticiosa Paraguaya (ANP), a news agency focused on Paraguayan opposition parties and organizations that operated in Buenos Aires from 1973 until it was closed by the Argentine military regime in 1977 and again from 1984 until the fall of General Alfredo Stroessner in 1989. Compiled over a thirty-year period by Guillermo Arturo Weyer, director of the ANP, the collection includes books, pamphlets, newspaper clippings, and thousands of documents from political, labor, peasant, student, and guerilla organizations.