Letters (Perry Rhodan #994)

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Overview:

1980 . Perry Rhodan, #994: Problem Langzeitwaffe (1980, various, Pabel-Moewig, DM 1.80, 68 pages, digest, MAGAZINE)
1980 . Perry Rhodan, #760: Kampf der Diplomaten (1980, various, Pabel-Moewig, DM 1.80, 68 pages, digest, MAGAZINE)
1980 . Perry Rhodan, #397: Das System der 13 Monde (1980, various, Pabel-Moewig, DM 1.80, 68 pages, digest, MAGAZINE)