Paleontology

Eurypterids of the Devonian Holland Quarry Shale of Ohio

The Rise and Progress of Palaeontology

Introduction to the Study of Palæontological Botany

Researches on the Visual Organs of the Trilobites

North American Plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus

Fossil Ice Crystals: An Instance of the Practical Value of “Pure Science”

A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas

Palæontological Report of the Princeton Scientific Expedition of 1877

The Pleistocene of North America and its vertebrated animals

Essay on the Theory of the Earth

Animals of the Past

Dinosaurs, with Special Reference to the American Museum Collections

The Chain of Life in Geological Time

The Coal Measures Amphibia of North America

Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: Eurypterida

Australasian Fossils: A Students' Manual of Palaeontology

Fossils: A Story of the Rocks and Their Record of Prehistoric Life Denver Museum of Natural History, Popular Series No. 3

Thoughts on a Pebble, or, A First Lesson in Geology

The cretaceous birds of New Jersey

Pleistocene Pocket Gophers From San Josecito Cave, Nuevo Leon, Mexico