Front Page Titles (by Subject) LV: Trajan to Pliny - Letters of Marcus Tullius Cicero
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LV: Trajan to Pliny - Marcus Tullius Cicero, Letters of Marcus Tullius Cicero 
Letters of Marcus Tullius Cicero: with his Treatises on Friendship and Old Age, trans. E.S. Shuckburgh. And Letters of Gaius Plinius Caecilius Secundus, trans. William Melmoth, revised by F.C.T. Bosanquet (New York: P.F. Collier, 1909).
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Trajan to Pliny
The diplomas whose dates are expired must by no means be made use of. For which reason it is an inviolable rule with me to send new instruments of this kind into all the provinces before they are immediately wanted.