1Patrick Gibson to Thomas Jefferson, with Postscript by John G. Robert (for Gibson), 23 February 1818 (Jefferson Papers)
Richmond, Va.; flour prices at [index entry]
2John G. Robert (for Patrick Gibson) to Thomas Jefferson, 16 March 1820 (Jefferson Papers)
Richmond, Va.; flour prices at [index entry]
3John G. Robert (for Patrick Gibson) to Thomas Jefferson, 30 April 1821 (Jefferson Papers)
Richmond, Va.; flour prices at [index entry]