1Thomas Jefferson to John Hollins, 8 April 1810 (Jefferson Papers)
Richmond, Va.; and gypsum [index entry]
2Thomas Jefferson to John Hollins, 20 January 1811 (Jefferson Papers)
Richmond, Va.; and gypsum [index entry]
3Thomas Jefferson to John Hollins, 5 February 1810 (Jefferson Papers)
Richmond, Va.; and gypsum [index entry]