In 1946, Edgar N. Johnson, later Professor of European History at the University of Nebraska, served as a political advisor for the American military government in Berlin. In diary-like letters, he described his meetings with important actors in American occupation politics such as General Lucius D. Clay, many representatives of the other occupying powers, and leading German political and cultural figures.

Werner Breunig and Jürgen Wetzel, Landesarchiv Berlin.