Preliminary Report on the Paleontology of the Black Hills, Containing Descriptions of New Species of Fossils from the Potsdam, Jurassic, and Cretaceous Formations of the Black Hills of Dakota

Preliminary Report on the Paleontology of the Black Hills, Containing Descriptions of New Species of Fossils from the Potsdam, Jurassic, and Cretaceous Formations of the Black Hills of Dakota