Dinosaurs the encyclopedia supplements

[dyno77]

Iv got alot of prehistoric books and others, and among them is the encyclopedia series by D.Glut .
Im not sure how many in this forum would have them in there collection ,but they are some the best dinosaur encyclopedias even if they are a few years old since the last supplement.
If you have them in your collection how would you rate them?
https://www.google.com/search?q=donald+glut+dinosaurs+the+encyclopedia&safe=strict&sxsrf=ALeKk038sBax4U0XUoRvKlhTDoaNA06vYQ:1601321996082&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjv4_ylzYzsAhWYmHIEHd2FB8QQ_AUoAXoECCEQAw&biw=1094&bih=426only

[Halichoeres]

They're all out of print now, right? At any rate they seem pretty hard to find. I have one of the supplements and it has quite a lot of good information in it, but I don't have any of the main volumes.

[Shonisaurus]

That was a very expensive encyclopedia. I remember that the Store of the Museum of Natural Sciences of Madrid sold volumes of the Glut encyclopedia for a whopping 300 euros each and there were even many volumes that cost much more.