Here is the Walt Disney Book of "Ariel and the Secret Grotto", released in 1990, although the cover is a new one from 1997(?) I think..? :P
But the images are all the same as the 1990 book. I used to have this one when I was a little boy and I LOVED it! I remember being scared of the part where Ariel gets captured by the octopus!
Read the story here: link