1. 2. EM Betts . Thomas Jefferson' Farm Book . Charlottesville, VA: University Press of Virginia. 1976 : 1 -552 .
2. 3. Letter to Elbridge Gerry, January 26, 1799., and MB Strauss . Familial Medical Quotations . Boston: Little, Brown, 1968 : 517 .
3. Contributions of Thomas Jefferson to American medicine