El progreso de la traccion electrica en el Ferrocarril Central Argentino
Latest model of cars of anglo-Argentina street railroad
Automatic block signaling system installations on French railways
Radio in aviation service in United States
Electrogyro and its applications to buses
Electric starting systems for automobiles
Propulsory systems in airplane testing tunnels
Respuesta De Vacas De Distinto Tamao Y De Sus Crias A Condiciones De Escasez Forrajera