In the following study, a few dozen of the thousands of letters collected over 33 years in the archives of the editorial office of "Nasz Przeszłość" have been selected, which relate both to editorial matters and to the person of the editor. The correspondence collected in the archive of the Publishing House comes from different parts of the world and different parts of Poland. They are letters from the highest dignitaries of the Church, Cardinals, Archbishops and Bishops, as well as from laymen who, either in their academic work or in their interests, were connected with the Editorial Office of the Studies on the History of the Church in Poland.