Alternate Realities: A Scifi Book Club discussion

Hi,
Does anyone have any suggestions for "classic" dinosaur-themed or related fiction ? I've read some of the classics such as "The Fog Horn" and "The Sound of Thunder", but I'm looking to expand my dinosaur "horizons", a bit.
I've heard that L. Sprague de Camp and Robert Silverberg have written some dinosaur stories but I haven't read them yet.

Thank You,
Bob

Gun for Dinosaur is really good, I would suggest the x minus one radio broadcast of it.

I don't know about classic dinosaur fiction, but there was a great short story in Analog Science Fiction and Fact, December 2014, called Dino Mate by Rosemary Claire Smith.

Arthur C. Doyle (of Sherlock Holmes fame) wrote "The Lost World." I haven't read it but I am pretty sure it has dinosaurs.

Thank you all for your fantastic suggestions... much food for thought here.
I see L. Sprague DeCamp mentioned in relation to Dino-themed science fiction/ fantasy. Has anyone read this author? Comments? Opinions?

Bob, did you ever pick any of these up, what did you think?

I ad fun with All Yesterdays: Unique and Speculative Views of Dinosaurs and Other Prehistoric Animals