Following the suggestion made in another post, I found the link to ‘Fabellae Latinae’ here: http://focusbookstore.com/lingua%20latina/fabellae.pdf
The text of this pdf, however, is a bit garbled. Is this the same for other people? Or is it just my computer? Does anyone have an ungarbled pdf they could send me, please?
There exist several versions of Fabellae Latinae. People keep adding stories to it.
As far as I know they were never published as a real book, but were at some time available as free downloads. Still are, but some are hard to find nowadays. Or garbled like the one you found.
Yesterday I luckely stumbled over the 2009 version (78 stories) here.