This series consists of correspondence received by Bianco. The major correspondents are Mexican writers Elena Garro and Octavio Paz, and Argentine writers Silvina Ocampo and Victoria Ocampo. Other correspondents include Julio Cortázar, Juan Gustavo Cobo Borda, César Fernández Moreno, Juan García Ponce, Jorge Guillén, Eduardo Mallea, Ezequiel Martínez Estrada, Adrienne Monnier, Daniel Moyano, Maurice Saillet, Alejandro Rossi, Ernesto Sábato, Eduardo Schiaffino, Virgilio Piñera, and Gabriel Zaid. There is also one letter by André Gide to Guillermo de Torre. This series is organized first by major and minor correspondents, with the letters of Garro, the Ocampo sisters, and Paz housed in individual folders arranged alphabetically. The remaining correspondents are grouped in collective folders and arranged alphabetically by correspondent, with the exception of the Gide letter to de Torre which is housed in an individual folder at the end of the series. See also series V. Additional Correspondence for further letters.