Titles by Charles Willard Diffin marked with tag: Project Gutenberg
- 2012 - The Pirate Planet
- 2009 - Two Thousand Miles Below
- 1932 - The Finding of Haldgren
- 1932 - The Hammer of Thor
- 1931 - Brood of the Dark Moon
- 1931 - Dark Moon
- 1931 - Holocaust
- 1931 - The Eye of Allah
- 1931 - When the Mountain Came to Miramar
- 1930 - Out of the Dreadful Depths
- 1930 - Spawn of the Stars
- 1930 - The Moon Master
- 1930 - The Power and the Glory