Dreizehn von der schwarzen Magie

From Author Wars - https://authorwars.com/books/dreizehn-von-der-schwarzen-magie-2528132.html

Overview:

Title: Dreizehn von der schwarzen Magie
Author: Bob Fisher
Year: 1977
Type: Short Fiction
Series: Nebelgeister
Number in Series: 24

Variant Titles:

1979. De 13 broeders der zwarte magie

Editions/Publications:

1977 . Dreizehn von der schwarzen Magie (1977, Bob Fisher, Zauberkreis, DM 1.20, 62 pages, digest, Chapter Book)