All the stories are in the public domain. Here are the sources I copied them from:
- The Fox and the Grapes by Aesop
- The Failure of Hope & Wandel by Ambrose Bierce
- Nyarlathotep by H.P. Lovecraft
- Christmas Presents, 1914 from Punch Magazine
- The Feast of Nemesis by Saki
- The Five Boons of Life by Mark Twain
- Luck by Mark Twain
Header photo by robfos, and puzzle book image in blog from Wikimedia commons. Both licensed CC-BY.