1William Thornton to Thomas Jefferson, 20 January 1812 (Jefferson Papers)
botany; and proposed Washington botanical garden [index entry]
2John Bradbury to Thomas Jefferson, 5 March 1812 (Jefferson Papers)
botany; and proposed Washington botanical garden [index entry]
3Thomas Jefferson to John Bradbury, 21 March 1812 (Jefferson Papers)
botany; and proposed Washington botanical garden [index entry]