1From Thomas Jefferson to Robert R. Livingston, 18 April 1802 (Jefferson Papers)
A favorable and a confidential opportunity offering by Mr. Dupont de Nemours, who is revisiting...
2Method of Using Robert Patterson’s Cipher: Editorial Note (Jefferson Papers)
I. DESCRIPTION OF METHOD , [18 APR. 1802] II. SAMPLE ENCIPHERMENT : THE LORD’S PRAYER, [18 APR....