"Ufficio trazione: monografie 1-8, B 35105, 43380, 44462, 46813, 53200, 53358, 56029, 57464-65350, 72988, 93773; C 291, 2832/33, 10124, 18050, 18297, 27307, 29591/92, 40350, 44156, 46239, 49060, 52467, 59793, 71534, 74472, 83700, 95550, 99222; D 6695, 703