Front Page Titles (by Subject) LXXVIII: Trajan to Pliny - Letters of Marcus Tullius Cicero
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LXXVIII: 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
If you will send me the decree of the senate, which occasioned your doubt, I shall be able to judge whether it is proper you should take upon yourself the enquiry of causes relating to claims of freedom by birth-right.