A baker's dozen of ebooks about dead critters, including ammonites, trilobites, pterosaurs, 

mosasaurs, ichthyosaurs, plesiosaurs, and some very horny dinosaurs.

Ammonites and Other Cephalopods of the Pierre Seaway
Ammonites
Oceans of Kansas-- A Natural History of the Western Interior Sea
Sea Dragons-- Predators of the Prehistoric Oceans
Seismosaurus-- The Earth Shaker
The Complete T. rex
The Ecology of Fossils-- an Illustrated Guide
The Horned Dinosaurs
The Pterosaurs-- From Deep Time
Trilobite! Eyewitness to Evolution
Trilobites in Wales
Trilobites of New York
Trilobites