1Thomas Jefferson to John Hollins, 5 February 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
2John Hollins to Thomas Jefferson, 9 February 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
3Thomas Jefferson to John Hollins, 16 February 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
4John Hollins to Thomas Jefferson, 18 March 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
5George Jefferson to Thomas Jefferson, 19 March 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
6Thomas Jefferson to John Hollins, 8 April 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
7Thomas Jefferson to Wilson Cary Nicholas, 16 April 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
8John Hollins to Thomas Jefferson, 22 April 1810 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
9Thomas Jefferson to John Hollins, 20 January 1811 (Jefferson Papers)
agriculture; use of gypsum in [index entry]
10John Hollins to Thomas Jefferson, 27 January 1811 (Jefferson Papers)
agriculture; use of gypsum in [index entry]