These books are mostly suitable for a modern campaign, as most of the books date from the late 20th century or later.
The myths and legends come from around the world but there is an edge towards Celtic and European mythology, including famous topics such as King Arthur.
To use, either roll d100 to pick a random result, or select an appropriate book manually.
Here are some sample results:
72. Persian Myths by V. Sarkhosh Curtis
73. Polynesian Mythology by G. Grey
74. Quetzalcoatl and the Irony of Empire: Myths and Prophecies in the Aztec Tradition
Released: March 21st 2015 Pages: 3