Author: Carlos Cueto (ed.), Pedro Dulanto, Fernando de Azevedo, Ernest Barker, Jorge Basadre, Jean Bayet, Jan Belehradek, Gaston Berger, Pedro Cebollero, James Bryant Conant, Honorio Delgado, Robert Dottrens, Juan García Bacca, Raymond Gibson, Lawrence Mc Ginley, Robert King Hall, B. A. Houssay, J. C. Jones, J. Lambert, Julián Merjas, Rodolfo Mondolfo, Alfonso Reyes, Pedro Roselló, Rafael Valle, Francesco Vito, Aloys Wenzl (auts.)