I have been playing with the Google n-gram viewer to look at when dinosaurs were appearing most often in books.
It looks like the late 1990s, in the wake of Jurassic Park was the top time to encounter dinosaurs in print.
But which dinosaurs? Here’s a selection:
The volume for brontosaurus surprises me and makes me wonder if that peak is Jurassic Park related.
I had to leave iguanodon off the search terms because the way the n-gram tabulates figures, the Fonz of the dinosaurs just dominates the 19th century:
These days the venerable iguanodon is level with the feathery newcomer velociraptor.