Häpna!
Book Series
by Kjell Ekström
Latest:
1966
Häpna! #2, 1957
by Kjell Ekström, Charles Eric Maine, Eric Frank Russell
Häpna! #4, april 1959
by Kjell Ekström, Arthur C. Clarke, Edmund W. Hansen
Häpna! #6, 1965
by Kjell Ekström, Edmund W. Hansen, Edward S. Sullivan