Jackson Barwis’ books are also preserved on Google Books:
Three Dialogues Concerning Liberty, from 1776.
Dialogues Concerning Innate Principles. from 1779.
A Fourth Dialogue Concerning Liberty, from 1793.
This website contains these books in transcribed form, otherwise unedited.
Please report any typos or suggestions to the webmaster.
Thanks to Deborah K. for the following photo of Jackson Barwis’ gravestone: