Out of the Silent Planet by C. S. Lewis (The Bodley Head)
Galactic Patrol by E. E. Smith (Astounding Stories, February 1938)
The Sword in the Stone by T. H. White (Collins)
The Legion of Time by Jack Williamson (Astounding Science-Fiction, July 1938)
And that's just the novels. Via Vox Popoli: Hugo recommendations: 1939 retro awards.