11Thomas Jefferson to Thomas Voigt, 20 May 1813 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
12Thomas Voigt to Thomas Jefferson, 3 September 1813 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
13Robert Patterson to Thomas Jefferson, 25 August 1815 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
14Thomas Jefferson to Robert Patterson, 13 October 1815 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
15Robert Patterson to Thomas Jefferson, 24 October 1815 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
16Robert Patterson to Thomas Jefferson, 28 November 1815 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
17Patrick Gibson to Thomas Jefferson, 22 December 1815 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
18Thomas Jefferson to Robert Patterson, 22 December 1815 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]
19Thomas Jefferson to John Vaughan, 15 January 1816 (Jefferson Papers)
Patterson, Robert; and astronomical case clock [index entry]