Before WWII, Victor Herold (1890–1956) edited the Brandenburg Church Visitation records from the Reformation period for the Prignitz, the State of Ruppin, the Uckermark, and the Mittelmark. In the wake of wartime losses, Herold’s manuscripts have acquired the quality of original sources. The index volume for the three “Mittelmark” part volumes includes common indexes of persons, places and subjects.