1John Breck Treat to Thomas Jefferson, 31 March 1809 (Jefferson Papers)
Having the preceeding three and half years resided at this place, during which time I have taken...
2Thomas Jefferson to John Breck Treat, 30 November 1809 (Jefferson Papers)
I recieved in due time your favor covering your meteorological Diary of the post of the Arkansas...
3John Breck Treat to Thomas Jefferson, 5 February 1810 (Jefferson Papers)
During a residence of the last five years at Arkansa , in Louisiana : I paid particular attention...
4Thomas Jefferson to John Breck Treat, 16 February 1810 (Jefferson Papers)
The above is a copy of a former letter to you acknoleging the reciept of your Meteorological...