- Author: Mario Staas Author Record # 265160
- Legal Name: Staas, Mario
- Language: German
- Used These Alternate Names: Mario Stass
- Note: From 1988 until the 1990s at home in Diepholz, Lower Saxony, Germany
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Essays
- Letter (Perry Rhodan #1377) (1988)
- Letter (Perry Rhodan #1556) (1991)
- Letter (Perry Rhodan #967) (1991)
- Letter (Perry Rhodan #1565) (1991) [only as by Mario Stass]
- Letter (Perry Rhodan #1566) (1991)
- Letter (Perry Rhodan #1579) (1991)
- Letter (Perry Rhodan #1595) (1992)
- Letter (Perry Rhodan #1626) (1992)
- Letter (Perry Rhodan #1822) (1996)
- Letter (Perry Rhodan #1827) (1996)
- Letter (Perry Rhodan #1846) (1997)
- Letter (Perry Rhodan #1848) (1997)
- Letter (Perry Rhodan #1849) (1997)
- Letter (Perry Rhodan #1850) (1997)
- Letter (Perry Rhodan #1853) (1997)
- Letter (Perry Rhodan #1857) (1997)
- Letter (Perry Rhodan #1857) [2] (1997)
- Letter (Perry Rhodan #1882) (1997)
- Letter: Ska und Poulton (1998)
- Letter: Buchmesse-Review (2003)
- Letter: Anmerkungen zu den Posbis (2003)
- Letter: Omega Centauri (2003)
- Letter: Thatrix und höhere Mächte (2003)
- Perry Rhodan auf der Buchmesse 2003 (2003)
- Letter (Perry Rhodan #2237) (2004)
- Letter (Perry Rhodan #2508) (2009)
- Letter: Spekulationen (2019)
- Das galaktische Rätsel (2020) by Clark Darlton