- X Marks the Asteroid
- X Marks the Pedwalk
- X Y Z - A Detective Story
- X-mas Sketches from the Dartmouth Literary Monthly
- XII conti pomiglianesi - con varianti avellinesi, montellesi, bagnolesi, milanesi, toscane, ecc.
- XXXII Ballades in Blue China [1885]
- Xerxes - Makers of History
- Xi Jing Za Ji
- Xin Xu
- Xingu - 1916
- Xingu - 1916