DfS, PHi, William Buell Sprague Autograph Collection, vol. 1, fol. 283. The addressee is determined by the letter's content and the continuing correspondence between Whipple and Josiah Bartlett from May until Nov. 1778, while Bartlett was attending the Continental Congress as a New Hampshire delegate. See, for example, see Whipple to Bartlett, 3 May in NDAR 12: 253, 1 June (above) and 29 June (below), and Bartlett to Whipple, 20 June (above).