Latest issue consulted: Jahrg. 45 (2002).
Latest issue consulted: Jahrg. 50 (2007).
Chiefly in German; some English and French.
Vols. for 1958-<1980> issued by: Franz Joseph Dölger-Institut an der Universität Bonn; 1975-<1980> under the auspices of: Rheinisch-Westfälische Akademie der Wissenschaften.