1Thomas Jefferson to Randolph Jefferson, 25 May 1813 (Jefferson Papers)
agriculture; crop rotation [index entry]
2Randolph Jefferson to Thomas Jefferson, 26 May 1813 (Jefferson Papers)
agriculture; crop rotation [index entry]
3William Plumer (1789–1854) to Thomas Jefferson, 31 December 1821 (Jefferson Papers)
agriculture; crop rotation [index entry]
4Nicholas Biddle to Thomas Jefferson, 9 February 1822 (Jefferson Papers)
agriculture; crop rotation [index entry]