The Goode Childe's Booke of Faerie Tales
Author unknown, this book of highly suspect and factually inaccurate stories is on the shelf at the Aching family farmhouse on The Chalk.
However, the equally unknown illustrator is a hundred times more talented than the storyteller, as his/her pictures are right on the money, as regards accurate depictions of supernatural entities. For one thing, the normally elusive Nac Mac Feegle were somehow persuaded to send a representative member of the race to pose for the artist, right down to the rude gesture.
It is possible that this book was also owned by Letitia in I Shall Wear Midnight and Mistress Slightly of the Dame School, mentioned in Snuff. On page seven there is a picture of a 'Jolly Goblin', and there is also the Discworld equivalent of the The Fairy Feller's Master-Stoke