Xenozoic Tales, a.k.a. Cadillacs & Dinosaurs, was a series set in the future where civilization had been destroyed & ancient lifeforms reborn.

Sketchbook Time In Overdrive
Page 10. Bottom sketch "Pencil sketch of Tyrannosaurus tracking three Triceratops."
Given that they've only got one horn & spiky frills, I'd say they were Styracosaurs.

Page 11. Second sketch. "Sketches of Tyrannosaurus and Brachiosaurus."
Brachiosaurus has a different shaped head & its front legs are bigger than their hind legs. These sketches are a more generic sauropod like say Apatosaurus or Camerasaurus.

Last Link In The Chain Originally printed in Xenozoic Tales #9
Page 20, Panel 5. Hannah says, "It the meantime, we wait."
In not It.

Report From The Resistance Originally printed in Xenozoic Tales #11
Mustapho Cairo, in hiding from Scharnhorst's lackeys, writes a letter to Dahlgren, naming her & mentioning her efforts to help those loyal to the old ways & detailing his attempts to sabotage Scharnhorst's ways. At the end he tells he "Take no unnecessary risks."
Like naming Dahlgren in the letter wasn't an unnecessary risk? There really wasn't any need to name her at all in the letter itself. As it is it could be her death warrant if it does fall into Scharnhorst's hands.