Bücher verfasst by Michael O'Hearn

Henry Ford and the Model T

Triceratops vs. Stegosaurus

Allosaurus vs. Brachiosaurus

Tyrannosaurus rex vs. Velociraptor

Spinosaurus vs. Giganotosaurus

Awesome Space Robots

Sea Monsters vs. Dragons

How Spirit Dog Made the Milky Way

The El Dorado Map