Tirocinium philolohum sodalium Regii Seminarii Bonnensis - Praetorius, Ernestus; Gercke, Alfred, 1860-1922; Berg, Hermannus; Brandt, Paulus; Hopeken, Iulius; Winter, Franciscus; Kemke, Iohannes; Ulrich, Oskar; Schumacher, Iacobus; Muellenbach, Ernestus (University of Cincinnati dissertations ., 1883)