Heikki Oja
Heikki Oja has written at least 2 books. Their most popular book is Eksoplaneetat with 1 save with an average rating of -⭐.
They are best known for writing in the genre Science.
Fundamental Astronomy
ByHannu Karttunen(editor),Pekka Kröger(Editor)
1987 • 1 Reader • 548 pages
Eksoplaneetat
ByHeikki Oja
1 Reader • 228 pages