1Thomas Jefferson to Patrick Gibson, 8 March 1816 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
2Thomas Jefferson to John Hollins, 5 February 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
3Thomas Jefferson to John Hollins, 8 April 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
4Thomas Jefferson to John Hollins, 16 February 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
5Thomas Jefferson to John Hollins, 20 January 1811 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
6Caspar Wistar to Thomas Jefferson, 9 October 1815 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
7John Hollins to Thomas Jefferson, 27 January 1811 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
8John Hollins to Thomas Jefferson, 9 February 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
9George Jefferson to Thomas Jefferson, 19 March 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
10Christopher Clark to Thomas Jefferson, 20 March 1816 (Jefferson Papers)
agriculture; use of gypsum in [index entry]