1From Thomas Jefferson to David Rittenhouse, 25 January 1786 (Jefferson Papers)
Your favor of Sep. 28. came to hand a few days ago. I thank you for the details on the Southern and Western lines. There remains thereon one article however which I will still beg you to inform me of, viz. how far is the Western boundary beyond the Meridian of Pittsburgh? This is necessary to enable me to trace that boundary in my map. I shall be much gratified also with a communication of...