- Author: Harry G. Watkins Author Record # 223721
- Legal Name: Watkins, Harry G.
- Language: German
- Used These Alternate Names: Glenn Douglas, Marcos Mongo
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Chapbooks
- Fluch über Dumpton Castle (1982) [only as by Marcos Mongo]
- Zaou sucht die Erde heim (1983) [only as by Marcos Mongo]
- Nandors Leichenbande (1983) [only as by Marcos Mongo]
- Zaou programmiert die Wachsfigur (1983) [only as by Marcos Mongo]
- Samantha, Braut der Hölle (1983) [only as by Marcos Mongo]
- Hochzeit des Blutes (1983) [only as by Marcos Mongo]
- Zaous Ende durch den Silberring (1984) [only as by Glenn Douglas]
- Wenn die Satanstochter erwacht (1984) [only as by Glenn Douglas]
- Dämon mit der Krallenklaue (1984) [only as by Glenn Douglas]
- Satans Klinik (1984) [only as by Glenn Douglas]
- Verschleppt ins Dämonenreich (1985) [only as by Glenn Douglas]
- In Londons Vampirnest (1985) [only as by Glenn Douglas]
- Vampirs Wiedergeburt (1985) [only as by Glenn Douglas]
- Das unheimliche Mordhaus (1985) [only as by Glenn Douglas]
- Die Zombie-Produzenten (1985) [only as by Glenn Douglas]
- Haus der toten Seelen (1986) [only as by Glenn Douglas]
- Sie verkauften sich dem Satan (1986) [only as by Glenn Douglas]
- Das Grauen aus dem Hexenbrunnen (1986) [only as by Glenn Douglas]
- Die Moorhexe (1986) [only as by Glenn Douglas]
- Schreckensparty der Dämonen (1986) [only as by Glenn Douglas]
- Fluch über Dumpton Castle (1982) [only as by Marcos Mongo]
- Zaou sucht die Erde heim (1983) [only as by Marcos Mongo]
- Nandors Leichenbande (1983) [only as by Marcos Mongo]
- Zaou programmiert die Wachsfigur (1983) [only as by Marcos Mongo]
- Samantha, Braut der Hölle (1983) [only as by Marcos Mongo]
- Hochzeit des Blutes (1983) [only as by Marcos Mongo]
- Zaous Ende durch den Silberring (1984) [only as by Glenn Douglas]
- Wenn die Satanstochter erwacht (1984) [only as by Glenn Douglas]
-
Dämon mit der Krallenklaue (1984)
only appeared as:
- Variant: Dämon mit der Krallenklaue (1984) [as by Glenn Douglas]
- Variant: Der Dämon mit der Krallenklaue (1991)
- Satans Klinik (1984) [only as by Glenn Douglas]
- Verschleppt ins Dämonenreich (1985) [only as by Glenn Douglas]
- In Londons Vampirnest (1985) [only as by Glenn Douglas]
- Vampirs Wiedergeburt (1985) [only as by Glenn Douglas]
- Das unheimliche Mordhaus (1985) [only as by Glenn Douglas]
- Die Zombie-Produzenten (1985) [only as by Glenn Douglas]
- Haus der toten Seelen (1986) [only as by Glenn Douglas]
- Sie verkauften sich dem Satan (1986) [only as by Glenn Douglas]
- Das Grauen aus dem Hexenbrunnen (1986) [only as by Glenn Douglas]
- Die Moorhexe (1986) [only as by Glenn Douglas]
- Schreckensparty der Dämonen (1986) [only as by Glenn Douglas]