Fossils

Life's Dawn on Earth

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

Field Book of Common Rocks and Minerals For identifying the Rocks and Minerals of the United States and interpreting their Origins and Meanings

Dinosaurs, with Special Reference to the American Museum Collections

Animals of the Past

The Glaciers of the Alps

The Coal Measures Amphibia of North America

The Black Moose in Pennsylvania

Evolution

The Radio Boys with the Forest Rangers; Or, The great fire on Spruce Mountain

The Romance of Modern Geology

The Adventures of a Grain of Dust

Glossary of Geological and Other Scientific Terms Used in the Principles of Geology

A Monograph of the Trilobites of North America: with Coloured Models of the Species

The Geology of Groton State Forest

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

Essay on the Theory of the Earth

North American Plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus

The Ultimate Rockhounding Handbook

Cambrian Ocean World