1John G. Robert (for Patrick Gibson) to Thomas Jefferson, 16 March 1820 (Jefferson Papers)
Robert, John Gibson; clerk for Gibson & Jefferson [index entry]
2John G. Robert (for Patrick Gibson) to Thomas Jefferson, 6 April 1820 (Jefferson Papers)
Robert, John Gibson; clerk for Gibson & Jefferson [index entry]
3John G. Robert (for Patrick Gibson) to Thomas Jefferson, 13 April 1820 (Jefferson Papers)
Robert, John Gibson; clerk for Gibson & Jefferson [index entry]