1To Thomas Jefferson from David Rittenhouse, 8 November 1788 (Jefferson Papers)
About two Months ago I received your very valuable present of Books, mentioned in the last letter...
2To Thomas Jefferson from David Rittenhouse, 14 April 1787 (Jefferson Papers)
About the latter end of June last I sent you the 2d. Vol. of our Transactions, directed to Mr....
3To Thomas Jefferson from David Rittenhouse, 26 June 1786 (Jefferson Papers)
Your favour of Jan. 25th. I received some time ago, and likewise all the Nautical Almanacs you...
4To Thomas Jefferson from David Rittenhouse, 28 September 1785 (Jefferson Papers)
That I have so long delayed acknowledging your favours has been owing to my absence from home....