1John Vaughan to Thomas Jefferson, 4 June 1819 (Jefferson Papers)
I have gratified more than one of my Boston friends by introducing them to your interesting retreat ; I am desirous of affording the same pleasure to my friend The Rev. M r Greenwood of Boston , one of the liberal & enlighten’d ministers of that place; having been brought up at Cambridge Mass. he can answer any enquiries you have Yet to make on the subject of Havard Colledge — D r Cooper ,