Paleontology

The Problem of Increasing Human Energy with special references to the harnessing of the Sun's energy

Dogs

The History of Creation

Biology of the Sauropod Dinosaurs

Hung Like An Argentine Duck: A Journey Back In Time To The Origins Of Sexual Intimacy

The Great Fossil Enigma

New Perspectives on Horned Dinosaurs

The Chain of Life in Geological Time

Mesozoic Sea Dragons

Palæontological Report of the Princeton Scientific Expedition of 1877

The Meaning of Evolution

On Electric Touch and the Molecular Changes produced in Matter by Electric Waves

The Corpuscular Theories of Gravitation

Field Book: Pennsylvanian Plant Fossils of Illinois

On the Conservation of Force

Eight Lectures on Theoretical Physics

Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: Eurypterida

On an Inversion of Ideas as to the Structure of the Universe

The natural and artificial disintegration of the elements

The Geological History of Fossil Butte National Monument and Fossil Basin