- Author: Janna Grashoff-Hageman Author Record # 169574
- Legal Name: Grashoff-Hageman, Janna
- Birthplace: The Hague, South Holland, Netherlands
- Birthdate: 28 July 1937
- Deathdate: 11 March 2004
- Language: Dutch
- Webpages: Wikipedia-NL
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Novels
- Drie Jongens en een Robot (1969) with Pieter Grashoff [only as by Pieter Grashoff]
- Drie Jongens en een Raket (1970) with Pieter Grashoff [only as by Pieter Grashoff]
- Drie Jongens en een Vliegende Schotel (1974) with Pieter Grashoff [only as by Pieter Grashoff]