Big Books of 2026

Join the Goodreads Author Program

Are you Heikki Oja, author of the books below?
Maailmankaikkeuden rakenne by Heikki Oja Einsteinin perintö - Mitä Albert Einstein ennusti oikein - ja... by Heikki Oja Universumi. by Heikki Oja Riimut. Viestejä viikingeiltä by Heikki Oja Eksoplaneetat by Heikki Oja Jäinen lohikäärme by Heikki Oja Aikakirja by Heikki Oja Galaksit by Heikki Oja Tähtitieteen sankareita – Newtonista nykypäivään by Heikki Oja Aurinkokunta uusiksi by Heikki Oja


To join the author program as Heikki Oja, you will first need to sign in to Goodreads. Then navigate back to this page to apply.


About the Author Program
Authors on Goodreads
Author Guidelines
Author Program How-To
Author & Advertisers Blog
Ask the Author: Featured Authors
About Goodreads