The book Solomon is reading called ABC Dinosaurs and Other Prehistoric Creatures by Jan Pienkowski. Available on Amazon here for $5.81 + $4.00 shipping. Or $60.00 for "like new" meaning someone didn't appreciate it enough to tear it up. (Children tear them up, that's how you know they loved it.)
But there are other better dinosaur pop-up books than this, several that get 5 star ratings.
I bought the Frozen pop-up book. Should get here on Wednesday. Finally remembered to use Lem's Amazon portal. I have the Poe's Raven book too. The ladies in the office were the first to see it and they properly flipped out. It's great having a book you can read in one minute.