Condor Print & Verlag did print a range of at least 6 magazine-like books. But there is only Prinz Eisenherz inside. Printed between 1980-1982. Book 3 also
contains a biography of Hal Foster, written by Jürgen Fuchs.
Besides this they print at least one "Condor Action Comic" with our hero. Printed between 1980-1983.
They also printed a "superhelden" serie in 1984. And it seems that in part 6 our hero was printed.