Carta a Ricardo Vegas García, [9/1924]
Carta a Bertha Molina (Ruth), 16/10/1920
Tarjeta Postal a Bertha Molina (Ruth), 3/8/1920
Tarjeta Postal a Ricardo Martínez de la Torre, 6/7/1920
Carta a Bertha Molina (Ruth), 30/6/1920
Tarjeta Postal a Ricardo Martínez de la Torre, 19/5/1920
Carta a Bertha Molina (Ruth) [2/1916]
Carta a Bertha Molina (Ruth), [1916]
Carta a Bertha Molina (Ruth), 21/11/1916
Carta a Bertha Molina (Ruth), 11/10/1916
Carta a Bertha Molina (Ruth), 17/9/1916
Carta a Bertha Molina (Ruth), 31/8/1916
Carta a Bertha Molina (Ruth), 11/8/1916
Carta a Bertha Molina (Ruth), 1-8-1916
Carta a Bertha Molina (Ruth), 13/7/1916
Carta a Bertha Molina (Ruth), 11/6/1916
Carta a Bertha Molina (Ruth), 8/6/1916
Carta a Bertha Molina (Ruth), 1/6/1916
Carta a Bertha Molina (Ruth), 7/6/1916
Carta a Bertha Molina (Ruth), 20/5/1916
Carta a Bertha Molina (Ruth), 19/5/1916
Carta a Bertha Molina (Ruth), 14/5/1916
Carta a Bertha Molina (Ruth), 7/5/1916
Carta a Bertha Molina (Ruth), 1/5/1916
Carta a Bertha Molina (Ruth), 26/4/1916
Carta a Bertha Molina (Ruth),16/4/1916
Carta a Bertha Molina (Ruth), 11/4/1916
Carta a Bertha Molina (Ruth), 10/4/1916
Carta a Bertha Molina (Ruth), 16/3/1916
Carta a Bertha Molina (Ruth), 9/3/1916
Carta a Bertha Molina (Ruth), 28/2/1916
Carta a Bertha Molina (Ruth), 4/2/1916
E. D. Morel - Pedro S. Zulen
Stefan Zweig, apologista e interprete de Tolstoy y Dostoyevski
Edwin Elmore
William J. Bryan
José Ingenieros
El sumo cicerone del foro romano
Lenin
Últimas aventuras de la vida de don Ramón del Valle Inclán
Maeztu y la dictadura
George Brandes
Panait Istrati
Tres libros de Panait Istrati sobre la U.R.S.S.
Sergio Essenin
Waldo Frank en Lima
El idealismo de Edwin Elmore
Georges Clemenceau
James Joyce
"Los que teníamos doce años", por Ernst Glaeser