- Author: Holger Kohlhoff Author Record # 281040
- Language: German
- Used These Alternate Names: Holger Kohhoff
- Note: Was 1993-1995 at home in Dorsten, North Rhine-Westphalia, Germany
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Essays
- Letter (Perry Rhodan #1070/1071) (1993) [only as by Holger Kohhoff]
- Letter (Perry Rhodan #1669) (1993) [only as by Holger Kohhoff]
- Letter (Perry Rhodan #1688) (1993)
- Letter (Perry Rhodan #1692) (1994)
- Letter (Perry Rhodan #1766) (1995)
- Letter (Perry Rhodan #1786) (1995)