Neilson's estate included a number of his own drawings and paintings: a "book of drawings of the U.Va. by Jno. Neilson," a "book of drawings of Ionic, Doric and Corinthian Orders by John Neilson," a "book of observations of the orders of architecture and intended to accompany this book of drawings of the orders," "3 books of drawings with drawings on oil paper," "a book of drawings and designs," and drawings of the Rotunda and two Pavilions.
