1Thomas Jefferson to Charles Willson Peale, 20 August 1811 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
2Charles Willson Peale to Thomas Jefferson, 9 September 1811 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
3Charles Willson Peale to Thomas Jefferson, 3 August [October] 1811 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
4Charles Willson Peale to Thomas Jefferson, 2 March 1812 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
5Charles Willson Peale to Thomas Jefferson, 28 December 1813 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
6Caspar Wistar to Thomas Jefferson, 9 October 1815 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
7Thomas Jefferson to Joel Yancey, 20 February 1816 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
8Thomas Jefferson to Richard Peters, 6 March 1816 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
9Thomas Jefferson to Patrick Gibson, 8 March 1816 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]
10Christopher Clark to Thomas Jefferson, 20 March 1816 (Jefferson Papers)
gypsum (plaster of paris); used as fertilizer [index entry]