The Bone Wars — Kathryn Lasky

In the mid-1870s, young teenage scout Thad Longsworth, blood brother to the Sioux visionary Black Elk, finds his destiny linked with that of three rival teams of paleontologists searching for dinosaur bones, as the Great Plains Indians prepare to go to war against the white man.Living in the Montana Badlands, Thaddeus Longworth and Julian DeMott are caught between deceitful paleontologists who slander, steal from, and spy on one another to gain access to fossils and ancient bones in the scared land of the Sioux