Cryptid Encyclopedia

[Nolan]

I read this book sometime around 1999. It was organized like a type of reference book or encyclopedia, and I believe it was part of a series of books (not the time life Mysteries of The Unknown).
It did not talk about any fantasy creatures, monsters or fairytale characters. Its specifically focused on bigfoot, yetis, aliens, and the loch-ness monster. I believe it had some other things as well, and I remember some photos of odd sea creature carcasses that fishermen had caught.
While it had photos, it also had a very interesting illustration style on the inside of the cover almost like not quite mastered airbrush art. It was a forest/mountain lake panorama scene that featured bigfoot, aliens, and sea monsters all in this mural style space of inside cover.
This is my first post in the group so my apologies if I am doing this wrong.

[Emmy]

Is it Mysteries, Monsters, And Untold Secrets? Only thing is its older than the time period you mentioned.