Paleontology

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

Dogs

Biology of the Sauropod Dinosaurs

The History of Creation

The Great Fossil Enigma

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

New Perspectives on Horned Dinosaurs

The Chain of Life in Geological Time

The natural and artificial disintegration of the elements

The cretaceous birds of New Jersey

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

The Geological History of Fossil Butte National Monument and Fossil Basin

Horned Armadillos and Rafting Monkeys

Mesozoic Sea Dragons

Palæontological Report of the Princeton Scientific Expedition of 1877

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

The Corpuscular Theories of Gravitation

The Last Link: Our Present Knowledge of the Descent of Man

The Meaning of Evolution

On the Conservation of Force