1William Thornton to Thomas Jefferson, 20 January 1812 (Jefferson Papers)
Whitlow, Charles; patents substitute for flax and hemp [index entry]
2Thomas Jefferson to William Thornton, 24 April 1812 (Jefferson Papers)
Whitlow, Charles; patents substitute for flax and hemp [index entry]
3William Thornton to Thomas Jefferson, 8 May 1812 (Jefferson Papers)
Whitlow, Charles; patents substitute for flax and hemp [index entry]