A long time ago, Harry Harrison wrote a series (https://en.wikipedia.org/wiki/West_of_Eden https://en.wikipedia.org/wiki/West_of_Eden) where dinosaurs weren't w

A long time ago, Harry Harrison wrote a series (https://en.wikipedia.org/wiki/West_of_Eden https://en.wikipedia.org/wiki/West_of_Eden) where dinosaurs weren't wiped out, evolving for millions of years before primates showed up. The dinosaurs have a genetic-engineering based industry.