1To Benjamin Franklin from Benjamin Rush, [after 15 September 1773] (Franklin Papers)
AL (incomplete): American Philosophical Society I acknowledge myself much indebted to you for the...
2To Benjamin Franklin from Benjamin Rush, 1 May 1773 (Franklin Papers)
ALS : American Philosophical Society I am much Obliged to you for Dr. Priestley’s Experiments....
3To Benjamin Franklin from Benjamin Rush, 14 October 1770 (Franklin Papers)
ALS : University of Pennsylvania The many Advantages which I derived from your Friendship Whilst...