. . "Letters, mostly in German, detail Johann Friedrich Ernst's personal and professional life in Northumberland County and Easton, 1776-1783; his letterbook, 1780-1786, contains copies of letters to such fellow pastors as Frederick Muhlenberg, Wilhelm Lehman, Immanuel Snozl as well as to Philadelphia printer, Charles Cist; a small personal diary, n.d.; and a religious and personal diary in the America" . .